Got Error How To Fix This ?

[nomoreturn]

How i can fix this error
Database error in vBulletin 4.1.6:

Invalid SQL:
select socialgroupmember.userid, socialgroupmember.groupid, socialgroup.name from vb_socialgroupmember as socialgroupmember
INNER JOIN vb_socialgroup as socialgroup ON socialgroupmember.groupid = socialgroup.groupid where socialgroupmember.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 2
Error Number : 1064
Request Date : Sunday, September 25th 2011 @ 06:25:05 PM
Error Date : Sunday, September 25th 2011 @ 06:25:05 PM
Script : http://www.mastdunya.com/external.php?count=10&days=120&do=rss&language=fr&sectionid=1&type=newcontent
Referrer :
IP Address : 66.***.72.**4
Username : Unregistered
Classname : vB_Database
MySQL Version :

[Fraxter]

Without the complete sql statement it's not possible to find the issue.
Is there any addon related to this bug?