Discuz! info: MySQL Query Error

Time: 2018-8-16 10:24pm
Script: /space.php

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

Similar error report has beed dispatched to administrator before.