Vbulletin database error
 

Any idea how to resolve this error?

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Database error in vBulletin 3.8.1:

Invalid SQL:
SELECT COUNT(postid) AS posts FROM _webpost WHERE userid =;

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, August 21st 2009 @ 05:25:51 PM
Error Date : Friday, August 21st 2009 @ 05:25:51 PM
Script : http://MYURL.com/webmaster/showthread.php?p=269302
Referrer :
IP Address : 77.250.xx.xx
Username : Unregistered
Classname : vB_Database
MySQL Version :