ibProArcade Database Error

mySQL query error: SELECT userid FROM user WHERE username='momma's_boy'

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 's_boy'' at line 1
mySQL error code:
Date: Sunday 19th of August 2007 12:18:21 PM

Everything's fine then suddenly we got that error everytime we go to the arcade page. How can we fix it? We're using version 2.6.3