WCF::destruct() Unhandled exception: PHP warning in file /var/www/vhosts/forodance.vservers.es/forodance.com/wcf/lib/system/database/Database.class.php (140): PDO::beginTransaction(): MySQL server has gone away

#0 [internal function]: wcf\system\WCF::handleError(2, 'PDO::beginTrans...', '/var/www/vhosts...', 140, Array)
#1 /var/www/vhosts/forodance.vservers.es/forodance.com/wcf/lib/system/database/Database.class.php(140): PDO->beginTransaction()
#2 /var/www/vhosts/forodance.vservers.es/forodance.com/wcf/lib/system/user/storage/UserStorageHandler.class.php(145): wcf\system\database\Database->beginTransaction()
#3 /var/www/vhosts/forodance.vservers.es/forodance.com/wcf/lib/system/WCF.class.php(179): wcf\system\user\storage\UserStorageHandler->shutdown()
#4 [internal function]: wcf\system\WCF::destruct()
#5 {main}