I got A problem who knows the repy?

[Mathiau]

Database error in vBulletin 3.5.3:

Invalid SQL:
SELECT dateline, userid FROM customavatar 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
Date : Tuesday, April 11th 2006 @ 04:01:18 PM
Script : http://www.xxxxxx/index.php?
Referrer : http://www.xxxxxxxx/admincp/index.php?do=head
IP Address : xxxxxxxxxxxx
Username : Mathiau
Classname : vb_database

Thanks in advance