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Database error in vBulletin 3.7.3:

Invalid SQL:
SELECT COUNT(threadid) AS total FROM thread WHERE postuserid=;

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 '' at line 1
Error Number : 1064
Request Date : Tuesday, December 23rd 2008 @ 04:02:30 PM
Error Date : Tuesday, December 23rd 2008 @ 04:02:30 PM
Script : http://forums.alkawthar2.com/showthread.php?t=169
Referrer :
IP Address : 66.249.65.136
Username : غير مسجل
Classname : vB_Database
MySQL Version :