SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb1_user2awards (userid, awardid, autoawardid, beschreibung) VALUES ('28', '23', '1', 'Vielschreiber')
mysql error: Duplicate entry '28-23-1' for key 'PRIMARY'
mysql error number: 1062
mysql version: 10.1.26-MariaDB-0+deb9u1
php version: 5.3.29
Date: 19.01.2021 @ 06:02
Script: /wbb2/board.php?boardid=10&daysprune=1000&sortfield=vote&sortorder=ASC
Referer: