Strange Problem

[iogames]

I just have a new user that went through the registration process and something happen, I received this email:
Database error in vBulletin 3.6.8:

Invalid SQL:
INSERT INTO userfield
(field600, field601, userid)
VALUES
('radio', 'UK', 29);

MySQL Error : Unknown column 'field600' in 'field list'
Error Number : 1054
Date : Thursday, December 13th 2007 @ 03:12:27 PM
Script : http://chat.iogames.com/register.php?do=addmember
Referrer : http://chat.iogames.com/register.php?do=register
IP Address : 81.102.224.63
Username : mackeyu1977k
Classname : vb_database

AND I CAN'T REMOVE IT FROM cP!!!
I had tried everything I know, still I can't remove it, its profile doesn't contain data....

What can I do?

[Marco van Herwaarden]

Does this still happen if you disable the plugin system?