Help My Site Please ..

i8 this iz my site www.liquidflo.com , But i cant edit users nor bann people for some reason , This iz whut comes up when i try

Database error in vBulletin Control Panel 2.2.5:

Invalid SQL: SELECT userid
FROM user
WHERE username='Da yung 1 '
AND userid <>
mysql error: You have an error in your SQL syntax near '' at line 4

mysql error number: 1064

Date: Tuesday 10th of September 2002 11:13:58 PM
Script: http://www.liquidflo.com/rap/rap/admin/user.php
Referer: http://www.liquidflo.com/rap/admin/u...edit&userid=13

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and i dont understand , me and the other admins r tryin to fix it but it's not working .. Plz help , if this iz the wrong forum , i'm sorry i just didnt kno where to put it ... plz help PLEEAAASEE :cross-eyed:

Peace