SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: UPDATE bb1_users SET firstvisit='1283961342' WHERE userid='0'
mysql error: Lost connection to MySQL server during query
mysql error number: 2013
mysql version: 5.0.77-log
php version: 4.4.7-tuxtools
Date: 08.09.2010 @ 17:56
Script: /sc-forum/board.php?boardid=27
Referer: