Database error in vBulletin 3.6.3

[Omanya.net]

Database error in vBulletin 3.6.3:

Invalid SQL:

SELECT * FROM user AS user
LEFT JOIN usergroup AS usergroup ON (user.usergroupid = usergroup.usergroupid)
WHERE user.username = 'AL-Bu'Saeed'i';

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 'Saeed'i'' at line 3
Error Number : 1064
Date : Saturday, August 18th 2007 @ 06:33:20 PM
Script : http://www.omanya.net/vb/showthread.php?p=333055
Referrer :
IP Address : 66.249.70.42
Username : غير مسجل
Classname : vb_database



What does this mean??

and how can I solve the problem???

[Steve Machol]

SQL Syntax errors are almost always related to modified code. To troubleshoot this, the first thing you need to do is remove any hacks or plugins, then see if you still have this problem.

If so, reupload all the original vB non-image files (except install.php). Make sure you upload these in ASCII format and overwrite the ones on the server.

Next, create a new style and choose no parent style. This will force it to use the default templates. Finally empty your browser cache, close all browser windows then try again. Make sure you change to the new style and view your forums with it. Do you have the same problem?