SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb1_searchinfos_hsp (userid, user, serie, format, cha, erw, tier, syn, buch, reg, ton, buchv, voting, date, tags_dabei, tags_nichtdabei, anz, direct, searchdate) VALUES (0, 'guest', 'ben, bib, but, dda, ddf, eig, ele, ffr, hun, kir, lbf, pum, tkk, wen, ', 'adv, bil, ddr, emi, eng, fin, gng, h80, hrb, hse, hsp, hsz, khs, kin, ldz, liv, min, pla, rad, re1, son, sou, spe, st1, st2, st3, st4, st5, tse, xma, ', '', '', '', '', '', '', '', '', '0 bis 10', '-315622800 bis 1664229600', '#B��ro', '', '0', '1', '1664262700')
mysql error: Incorrect string value: '\xEF\xBF\xBD\xEF\xBF\xBD...' for column `web4001_hsppar`.`bb1_searchinfos_hsp`.`tags_dabei` at row 1
mysql error number: 1366
mysql version: 10.5.15-MariaDB-0+deb11u1-log
php version: 5.6.40
Date: 27.09.2022 @ 09:11
Script: /hoerspiele.php?action=search&tag=B%EF%BF%BD%EF%BF%BDro
Referer: