SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: SELECT * FROM bb1_info_charaktere WHERE (charakter = 'Benjamin Bl��mchen' OR (charakter LIKE '%Benjamin Bl��mchen%' AND charakter LIKE '%;%') OR charakter LIKE 'Benjamin Bl��mchen%[%') AND synchronsprecher != '---'
mysql error: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb4_unicode_ci,COERCIBLE) for operation '='
mysql error number: 1267
mysql version: 10.1.48-MariaDB-0+deb9u2
php version: 5.6.40
Date: 18.09.2021 @ 09:05
Script: /hoerspiele.php?action=search&char=Benjamin%20Bl%EF%BF%BD%EF%BF%BDmchen
Referer: