SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.4): Invalid SQL: SELECT postid, attachments FROM bb1_posts WHERE threadid = '37' AND visible=1 ORDER BY posttime ASC LIMIT -30, 10 
mysql error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-30, 10' at line 1 
mysql error number: 1064 
mysql version: 4.1.16-max 
php version: 5.1.6 
Date: 23.07.2007 @ 23:55 
Script: /forum/thread.php?threadid=37&page=-2