SQL Error: 1267 - Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_persian_ci,IMPLICIT) for operation '='

MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:

1267 - Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_persian_ci,IMPLICIT) for operation '='

Query:

SELECT t.*
,t.subject AS threadsubject
,u.username
,u.usergroup
,u.displaygroup
,i.*
,i.NAME AS iconname
,t.dateline AS threaddate
,t.lastpost AS threadlastpost
FROM mybb_threads t
LEFT JOIN mybb_icons i ON (i.iid = t.icon)
LEFT JOIN mybb_users u ON (t.lastposter = u.username)
WHERE t.visible = '1'
AND t.uid = '54445'
GROUP BY t.tid
ORDER BY threadlastpost DESC LIMIT 5

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