username changed randomly now causing an error..
 

Hi,

One of my users had his named changed from iPwn™ to iPwnâ„¢ and when I attempt to change it back via admincp it outputs the following error;

Code:
Database error in vBulletin 3.8.4:

Invalid SQL:

SELECT userid, username FROM user
WHERE userid != 533019
AND
(
username = 'iPwn™'
OR
username = 'iPwn™'
);

MySQL Error : Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='
Error Number : 1267
Help appreciated.