Discuz! info: MySQL Query Error

Time: 2008-9-7 7:55am
Script: /forum/space.php

SQL: SELECT m.*, mf.*, s.lastactivity as online
FROM [Table]members m
LEFT JOIN [Table]memberfields mf ON mf.uid=m.uid
LEFT JOIN [Table]sessions s ON s.uid=m.uid AND s.invisible='0'
WHERE m.username='骂街一号' LIMIT 1
Error: Illegal mix of collations (utf8_general_ci,IMPLICIT) and (gbk_chinese_ci,COERCIBLE) for operation '='
Errno.: 1267