Just When You Thought...

[eshrink]

No changes to my site today.

Then several minutes ago, a series of these arrived

Any input as to cause and cure would be much appreciated:

________________________________________________

Database error in vBulletin 4.1.7:

Invalid SQL:

SELECT reason, liftdate
FROM userban
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 3
Error Number : 1064
Request Date : Tuesday, November 15th 2011 @ 01:02:53 PM
Error Date : Tuesday, November 15th 2011 @ 01:02:53 PM
Script : http://www.____.com/forums/usercp.php
Referrer : http://www.______.com/forums/usercp.php
IP Address : 58.97.228.22
Username :
Classname : vB_Database
MySQL Version :