MySQL error in file: /engine/forum/posts.init.php at line 35

Error Number: 1267

The Error returned was:
Illegal mix of collations (utf8mb4_general_ci,IMPLICIT) and (utf8mb3_general_ci,COERCIBLE) for operation '='

SQL query:

SELECT user_id, fullname FROM dle_users WHERE name = '�������� ������ -6863 union all select 1,1,1,1,1,1,1,CONCAT(0x3a6f79753a,0x4244764877697569706b,0x3a70687a3a),1#'