i need your help database error

[aim4fun]

my site gives me this database error

Database error in vBulletin 3.6.5:

Invalid SQL:

				SELECT * FROM user AS user
				LEFT JOIN usergroup AS usergroup ON (user.usergroupid = usergroup.usergroupid)
				WHERE user.username = 'Dr Mo'men';

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 'men'' at line 3
Error Number : 1064
Date         : Friday, October 19th 2007 @ 07:14:15 PM
Script       : http://aim4fun.com/vb/index.php
Referrer     : 
IP Address   : 41.235.132.127
Username     : dr-killer
Classname    : vb_database

any one can solve this problem ?

--------------- Added [DATE]1192850934[/DATE] at [TIME]1192850934[/TIME] ---------------

some one help