SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: SELECT * FROM bb1_info_charaktere WHERE (synchronsprecher = 'Susanna Bonas��wicz' OR (synchronsprecher LIKE '%Susanna Bonas��wicz%' AND synchronsprecher LIKE '%;%') OR synchronsprecher LIKE 'Susanna Bonas��wicz%[%') AND synchronsprecher != '---' AND synchronsprecher != '-hb-'
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: 02.08.2021 @ 18:13
Script: /hoerspiele.php?action=search&syn=Susanna%20Bonas%EF%BF%BD%EF%BF%BDwicz
Referer: