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Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: CREATE TABLE {semaphore} ( `name` VARCHAR(255) CHARACTER SET ascii COLLATE ascii_general_ci NOT NULL DEFAULT '' COMMENT 'Primary Key: Unique name.', `value` VARCHAR(255) CHARACTER SET ascii COLLATE ascii_general_ci NOT NULL DEFAULT '' COMMENT 'A value for the semaphore.', `expire` DOUBLE NOT NULL COMMENT 'A Unix timestamp with microseconds indicating when the semaphore should expire.', PRIMARY KEY (`name`), INDEX `value` (`value`), INDEX `expire` (`expire`) ) ENGINE = InnoDB DEFAULT CHARACTER SET utf8mb4 COMMENT 'Table for holding semaphores, locks, flags, etc. that…'; Array ( ) in Drupal\Core\Cron->run() (line 129 of core/lib/Drupal/Core/Cron.php). 
Drupal\Core\Cron->run() (Line: 75)
Drupal\Core\ProxyClass\Cron->run() (Line: 65)
Drupal\automated_cron\EventSubscriber\AutomatedCron->onTerminate(Object, 'kernel.terminate', Object)
call_user_func(Array, Object, 'kernel.terminate', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.terminate', Object) (Line: 88)
Symfony\Component\HttpKernel\HttpKernel->terminate(Object, Object) (Line: 32)
Stack\StackedHttpKernel->terminate(Object, Object) (Line: 671)
Drupal\Core\DrupalKernel->terminate(Object, Object) (Line: 22)