Uncaught exception thrown in session handler.

Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT 1 AS expression FROM {sessions} sessions WHERE sid = :db_condition_placeholder_0; Array ( [:db_condition_placeholder_0] => 3_5zsQ2vfAQc9DqrThkYPI9t7mnpxi5d1atiFV30_nE ) in Drupal\Core\Session\SessionHandler->write() (line 84 of /home/sites/mandis/core/lib/Drupal/Core/Session/SessionHandler.php).
Drupal\Core\Session\SessionHandler->write('xCxAuoa4RJopRFApSek2iDrV1HgnZOD5yRmJeEhqCzM', '_symfony_flashes|a:1:{s:5:"error";a:3:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:4906:"<em class="placeholder">Warning</em>: PDOStatement::execute(): MySQL server has gone away in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 634)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 510)
Drupal\Core\Database\Query\Select-&gt;execute() (Line: 2505)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;getFacets(Object, Object, &#039;0&#039;) (Line: 1653)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;search(Object) (Line: 468)
Drupal\search_api\Entity\Server-&gt;search(Object) (Line: 539)
Drupal\search_api\Query\Query-&gt;execute() (Line: 575)
Drupal\search_api\Plugin\views\query\SearchApiQuery-&gt;execute(Object) (Line: 1426)
Drupal\views\ViewExecutable-&gt;execute(NULL) (Line: 1454)
Drupal\views\ViewExecutable-&gt;render() (Line: 191)
Drupal\views\Plugin\views\display\Page-&gt;execute() (Line: 1630)
Drupal\views\ViewExecutable-&gt;executeDisplay(&#039;page_1&#039;, Array) (Line: 77)
Drupal\views\Element\View::preRenderViewElement(Array)
call_user_func_array(Array, Array) (Line: 100)
Drupal\Core\Render\Renderer-&gt;doTrustedCallback(Array, Array, &#039;Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. Support for this callback implementation is deprecated in 8.8.0 and will be removed in Drupal 9.0.0. See https://www.drupal.org/node/2966725&#039;, &#039;silenced_deprecation&#039;, &#039;Drupal\Core\Render\Element\RenderCallbackInterface&#039;) (Line: 781)
Drupal\Core\Render\Renderer-&gt;doCallback(&#039;#pre_render&#039;, Array, Array) (Line: 372)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array, ) (Line: 226)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 227)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;prepare(Array, Object, Object) (Line: 117)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 30)
Drupal\automator\StackMiddleware\Tideways-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:1;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:4913:"<em class="placeholder">Warning</em>: PDOStatement::execute(): Error reading result set's header in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 634)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 510)
Drupal\Core\Database\Query\Select-&gt;execute() (Line: 2505)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;getFacets(Object, Object, &#039;0&#039;) (Line: 1653)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;search(Object) (Line: 468)
Drupal\search_api\Entity\Server-&gt;search(Object) (Line: 539)
Drupal\search_api\Query\Query-&gt;execute() (Line: 575)
Drupal\search_api\Plugin\views\query\SearchApiQuery-&gt;execute(Object) (Line: 1426)
Drupal\views\ViewExecutable-&gt;execute(NULL) (Line: 1454)
Drupal\views\ViewExecutable-&gt;render() (Line: 191)
Drupal\views\Plugin\views\display\Page-&gt;execute() (Line: 1630)
Drupal\views\ViewExecutable-&gt;executeDisplay(&#039;page_1&#039;, Array) (Line: 77)
Drupal\views\Element\View::preRenderViewElement(Array)
call_user_func_array(Array, Array) (Line: 100)
Drupal\Core\Render\Renderer-&gt;doTrustedCallback(Array, Array, &#039;Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. Support for this callback implementation is deprecated in 8.8.0 and will be removed in Drupal 9.0.0. See https://www.drupal.org/node/2966725&#039;, &#039;silenced_deprecation&#039;, &#039;Drupal\Core\Render\Element\RenderCallbackInterface&#039;) (Line: 781)
Drupal\Core\Render\Renderer-&gt;doCallback(&#039;#pre_render&#039;, Array, Array) (Line: 372)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array, ) (Line: 226)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 227)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;prepare(Array, Object, Object) (Line: 117)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 30)
Drupal\automator\StackMiddleware\Tideways-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:2;s:901:"SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &lt;&gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC; Array
(
    [:db_condition_placeholder_0] =&gt; category
    [:db_condition_placeholder_1] =&gt; 1
    [:db_condition_placeholder_2] =&gt; 1
    [:db_condition_placeholder_3] =&gt; el
    [:db_condition_placeholder_4] =&gt; el
    [:score] =&gt; 1000
)
";}}_sf2_meta|a:3:{s:1:"u";i:1750301769;s:1:"c";i:1750301769;s:1:"l";s:7:"2000000";}') (Line: 89)
Drupal\Core\Session\WriteSafeSessionHandler->write('xCxAuoa4RJopRFApSek2iDrV1HgnZOD5yRmJeEhqCzM', '_symfony_flashes|a:1:{s:5:"error";a:3:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:4906:"<em class="placeholder">Warning</em>: PDOStatement::execute(): MySQL server has gone away in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 634)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 510)
Drupal\Core\Database\Query\Select-&gt;execute() (Line: 2505)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;getFacets(Object, Object, &#039;0&#039;) (Line: 1653)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;search(Object) (Line: 468)
Drupal\search_api\Entity\Server-&gt;search(Object) (Line: 539)
Drupal\search_api\Query\Query-&gt;execute() (Line: 575)
Drupal\search_api\Plugin\views\query\SearchApiQuery-&gt;execute(Object) (Line: 1426)
Drupal\views\ViewExecutable-&gt;execute(NULL) (Line: 1454)
Drupal\views\ViewExecutable-&gt;render() (Line: 191)
Drupal\views\Plugin\views\display\Page-&gt;execute() (Line: 1630)
Drupal\views\ViewExecutable-&gt;executeDisplay(&#039;page_1&#039;, Array) (Line: 77)
Drupal\views\Element\View::preRenderViewElement(Array)
call_user_func_array(Array, Array) (Line: 100)
Drupal\Core\Render\Renderer-&gt;doTrustedCallback(Array, Array, &#039;Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. Support for this callback implementation is deprecated in 8.8.0 and will be removed in Drupal 9.0.0. See https://www.drupal.org/node/2966725&#039;, &#039;silenced_deprecation&#039;, &#039;Drupal\Core\Render\Element\RenderCallbackInterface&#039;) (Line: 781)
Drupal\Core\Render\Renderer-&gt;doCallback(&#039;#pre_render&#039;, Array, Array) (Line: 372)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array, ) (Line: 226)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 227)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;prepare(Array, Object, Object) (Line: 117)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 30)
Drupal\automator\StackMiddleware\Tideways-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:1;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:4913:"<em class="placeholder">Warning</em>: PDOStatement::execute(): Error reading result set's header in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 634)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 510)
Drupal\Core\Database\Query\Select-&gt;execute() (Line: 2505)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;getFacets(Object, Object, &#039;0&#039;) (Line: 1653)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;search(Object) (Line: 468)
Drupal\search_api\Entity\Server-&gt;search(Object) (Line: 539)
Drupal\search_api\Query\Query-&gt;execute() (Line: 575)
Drupal\search_api\Plugin\views\query\SearchApiQuery-&gt;execute(Object) (Line: 1426)
Drupal\views\ViewExecutable-&gt;execute(NULL) (Line: 1454)
Drupal\views\ViewExecutable-&gt;render() (Line: 191)
Drupal\views\Plugin\views\display\Page-&gt;execute() (Line: 1630)
Drupal\views\ViewExecutable-&gt;executeDisplay(&#039;page_1&#039;, Array) (Line: 77)
Drupal\views\Element\View::preRenderViewElement(Array)
call_user_func_array(Array, Array) (Line: 100)
Drupal\Core\Render\Renderer-&gt;doTrustedCallback(Array, Array, &#039;Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. Support for this callback implementation is deprecated in 8.8.0 and will be removed in Drupal 9.0.0. See https://www.drupal.org/node/2966725&#039;, &#039;silenced_deprecation&#039;, &#039;Drupal\Core\Render\Element\RenderCallbackInterface&#039;) (Line: 781)
Drupal\Core\Render\Renderer-&gt;doCallback(&#039;#pre_render&#039;, Array, Array) (Line: 372)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array, ) (Line: 226)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 227)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;prepare(Array, Object, Object) (Line: 117)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 30)
Drupal\automator\StackMiddleware\Tideways-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:2;s:901:"SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &lt;&gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC; Array
(
    [:db_condition_placeholder_0] =&gt; category
    [:db_condition_placeholder_1] =&gt; 1
    [:db_condition_placeholder_2] =&gt; 1
    [:db_condition_placeholder_3] =&gt; el
    [:db_condition_placeholder_4] =&gt; el
    [:score] =&gt; 1000
)
";}}_sf2_meta|a:3:{s:1:"u";i:1750301769;s:1:"c";i:1750301769;s:1:"l";s:7:"2000000";}') (Line: 67)
Symfony\Component\HttpFoundation\Session\Storage\Proxy\SessionHandlerProxy->write('xCxAuoa4RJopRFApSek2iDrV1HgnZOD5yRmJeEhqCzM', '_symfony_flashes|a:1:{s:5:"error";a:3:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:4906:"<em class="placeholder">Warning</em>: PDOStatement::execute(): MySQL server has gone away in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 634)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 510)
Drupal\Core\Database\Query\Select-&gt;execute() (Line: 2505)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;getFacets(Object, Object, &#039;0&#039;) (Line: 1653)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;search(Object) (Line: 468)
Drupal\search_api\Entity\Server-&gt;search(Object) (Line: 539)
Drupal\search_api\Query\Query-&gt;execute() (Line: 575)
Drupal\search_api\Plugin\views\query\SearchApiQuery-&gt;execute(Object) (Line: 1426)
Drupal\views\ViewExecutable-&gt;execute(NULL) (Line: 1454)
Drupal\views\ViewExecutable-&gt;render() (Line: 191)
Drupal\views\Plugin\views\display\Page-&gt;execute() (Line: 1630)
Drupal\views\ViewExecutable-&gt;executeDisplay(&#039;page_1&#039;, Array) (Line: 77)
Drupal\views\Element\View::preRenderViewElement(Array)
call_user_func_array(Array, Array) (Line: 100)
Drupal\Core\Render\Renderer-&gt;doTrustedCallback(Array, Array, &#039;Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. Support for this callback implementation is deprecated in 8.8.0 and will be removed in Drupal 9.0.0. See https://www.drupal.org/node/2966725&#039;, &#039;silenced_deprecation&#039;, &#039;Drupal\Core\Render\Element\RenderCallbackInterface&#039;) (Line: 781)
Drupal\Core\Render\Renderer-&gt;doCallback(&#039;#pre_render&#039;, Array, Array) (Line: 372)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array, ) (Line: 226)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 227)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;prepare(Array, Object, Object) (Line: 117)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 30)
Drupal\automator\StackMiddleware\Tideways-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:1;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:4913:"<em class="placeholder">Warning</em>: PDOStatement::execute(): Error reading result set's header in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 634)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &amp;lt;&amp;gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC&#039;, Array, Array) (Line: 510)
Drupal\Core\Database\Query\Select-&gt;execute() (Line: 2505)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;getFacets(Object, Object, &#039;0&#039;) (Line: 1653)
Drupal\search_api_db\Plugin\search_api\backend\Database-&gt;search(Object) (Line: 468)
Drupal\search_api\Entity\Server-&gt;search(Object) (Line: 539)
Drupal\search_api\Query\Query-&gt;execute() (Line: 575)
Drupal\search_api\Plugin\views\query\SearchApiQuery-&gt;execute(Object) (Line: 1426)
Drupal\views\ViewExecutable-&gt;execute(NULL) (Line: 1454)
Drupal\views\ViewExecutable-&gt;render() (Line: 191)
Drupal\views\Plugin\views\display\Page-&gt;execute() (Line: 1630)
Drupal\views\ViewExecutable-&gt;executeDisplay(&#039;page_1&#039;, Array) (Line: 77)
Drupal\views\Element\View::preRenderViewElement(Array)
call_user_func_array(Array, Array) (Line: 100)
Drupal\Core\Render\Renderer-&gt;doTrustedCallback(Array, Array, &#039;Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. Support for this callback implementation is deprecated in 8.8.0 and will be removed in Drupal 9.0.0. See https://www.drupal.org/node/2966725&#039;, &#039;silenced_deprecation&#039;, &#039;Drupal\Core\Render\Element\RenderCallbackInterface&#039;) (Line: 781)
Drupal\Core\Render\Renderer-&gt;doCallback(&#039;#pre_render&#039;, Array, Array) (Line: 372)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array, ) (Line: 226)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 227)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;prepare(Array, Object, Object) (Line: 117)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 30)
Drupal\automator\StackMiddleware\Tideways-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:2;s:901:"SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT t_2.word AS value, COUNT(DISTINCT t.item_id) AS num
FROM
(SELECT DISTINCT t.item_id AS item_id, :score AS score
FROM
{search_api_db_db_product_index} t
WHERE ((t.status = :db_condition_placeholder_1) AND ((t.field_b2b_product &lt;&gt; :db_condition_placeholder_2) OR (t.field_b2b_product IS NULL))) AND (t.search_api_language IN (:db_condition_placeholder_3)) AND (t.search_api_language IN (:db_condition_placeholder_4))) t
INNER JOIN {search_api_db_db_product_index_text} t_2 ON t.item_id = t_2.item_id
WHERE t_2.field_name = :db_condition_placeholder_0
GROUP BY value
ORDER BY num DESC, value ASC; Array
(
    [:db_condition_placeholder_0] =&gt; category
    [:db_condition_placeholder_1] =&gt; 1
    [:db_condition_placeholder_2] =&gt; 1
    [:db_condition_placeholder_3] =&gt; el
    [:db_condition_placeholder_4] =&gt; el
    [:score] =&gt; 1000
)
";}}_sf2_meta|a:3:{s:1:"u";i:1750301769;s:1:"c";i:1750301769;s:1:"l";s:7:"2000000";}')
session_write_close() (Line: 268)
Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->save() (Line: 204)
Drupal\Core\Session\SessionManager->save() (Line: 196)
Symfony\Component\HttpFoundation\Session\Session->save() (Line: 60)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 30)
Drupal\automator\StackMiddleware\Tideways->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
Redirecting to /core/install.php Redirecting to /core/install.php.