[ مشكله ] : vBulletin Database Error

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Database error in vBulletin 3.8.7:

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 : Friday, September 23rd 2011 @ 10:25:51 AM
Error Date : Friday, September 23rd 2011 @ 10:25:51 AM
Script : http://www.xxxxx.com/external.php?type=RSS2
Referrer :



IP Address : xxxxxx
Username : غير مسجل
Classname : vB_Database
MySQL Version :







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