WCF::destruct() Unhandled exception: Cannot begin transaction

#0 /home/nekopatc/js/wcf/lib/system/user/storage/UserStorageHandler.class.php(145): wcf\system\database\Database->beginTransaction()
#1 /home/nekopatc/js/wcf/lib/system/WCF.class.php(179): wcf\system\user\storage\UserStorageHandler->shutdown()
#2 [internal function]: wcf\system\WCF::destruct()
#3 {main}