MyBB has experienced an internal SQL error and cannot continue.

SQL Error:

1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'miroshin_forumbk.mybb_posts.uid' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

Query:

SELECT uid FROM mybb_posts WHERE FROM_UNIXTIME(dateline, '%Y-%m-%d') >= DATE_ADD(CURDATE(), INTERVAL(-WEEKDAY(CURDATE())) DAY) group by username ORDER BY COUNT(username) DESC limit 0,1

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