MySQL error in file: /engine/modules/calendar.php at line 213

Error Number: 1064

The Error returned was:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'only_full_group_by m_date ORDER BY date desc' at line 1

SQL query:

SELECT DATE_FORMAT(date,'%b %Y') AS m_date, COUNT(id) AS cnt FROM dle_post WHERE approve=1 AND date < '2020-06-04 06:37:06' only_full_group_by m_date ORDER BY date desc