Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in /var/www/html/clade/core/lib/Drupal/Core/Database/StatementWrapperIterator.php:113 Stack trace: #0 /var/www/html/clade/core/lib/Drupal/Core/Database/StatementWrapperIterator.php(113): PDOStatement->execute() #1 /var/www/html/clade/core/lib/Drupal/Core/Database/Connection.php(851): Drupal\Core\Database\StatementWrapperIterator->execute() #2 /var/www/html/clade/core/lib/Drupal/Core/Database/Query/Select.php(524): Drupal\Core\Database\Connection->query() #3 /var/www/html/clade/core/lib/Drupal/Core/Database/Query/Merge.php(379): Drupal\Core\Database\Query\Select->execute() #4 /var/www/html/clade/core/lib/Drupal/Core/Session/SessionHandler.php(95): Drupal\Core\Database\Query\Merge->execute() #5 /var/www/html/clade/core/lib/Drupal/Core/Session/SessionHandler.php(109): Drupal\Core\Session\SessionHandler->Drupal\Core\Session\{closure}() #6 /var/www/html/clade/core/lib/Drupal/Core/Session/WriteSafeSessionHandler.php(95): Drupal\Core\Session\SessionHandler->write() #7 /var/www/html/clade/vendor/symfony/http-foundation/Session/Storage/Proxy/SessionHandlerProxy.php(54): Drupal\Core\Session\WriteSafeSessionHandler->write() #8 [internal function]: Symfony\Component\HttpFoundation\Session\Storage\Proxy\SessionHandlerProxy->write() #9 [internal function]: session_write_close() #10 {main} Next 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] => wiYw1GKAjGliHex8fbnmNzlE3gjw8OMFtJPZAHvhRXU ) in /var/www/html/clade/core/modules/mysql/src/Driver/Database/mysql/ExceptionHandler.php:56 Stack trace: #0 /var/www/html/clade/core/lib/Drupal/Core/Database/Connection.php(883): Drupal\mysql\Driver\Database\mysql\ExceptionHandler->handleExecutionException() #1 /var/www/html/clade/core/lib/Drupal/Core/Database/Query/Select.php(524): Drupal\Core\Database\Connection->query() #2 /var/www/html/clade/core/lib/Drupal/Core/Database/Query/Merge.php(379): Drupal\Core\Database\Query\Select->execute() #3 /var/www/html/clade/core/lib/Drupal/Core/Session/SessionHandler.php(95): Drupal\Core\Database\Query\Merge->execute() #4 /var/www/html/clade/core/lib/Drupal/Core/Session/SessionHandler.php(109): Drupal\Core\Session\SessionHandler->Drupal\Core\Session\{closure}() #5 /var/www/html/clade/core/lib/Drupal/Core/Session/WriteSafeSessionHandler.php(95): Drupal\Core\Session\SessionHandler->write() #6 /var/www/html/clade/vendor/symfony/http-foundation/Session/Storage/Proxy/SessionHandlerProxy.php(54): Drupal\Core\Session\WriteSafeSessionHandler->write() #7 [internal function]: Symfony\Component\HttpFoundation\Session\Storage\Proxy\SessionHandlerProxy->write() #8 [internal function]: session_write_close() #9 {main} thrown in /var/www/html/clade/core/modules/mysql/src/Driver/Database/mysql/ExceptionHandler.php on line 56