SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb3_user2awards (userid, awardid, autoawardid, beschreibung) VALUES ('2', '15', '20', 'Top Wortmix')
mysql error: Duplicate entry '2-15-20' for key 'PRIMARY'
mysql error number: 1062
mysql version: 10.5.23-MariaDB-1:10.5.23+maria~ubu2004-log
php version: 5.6.40-nmm8
Date: 13.05.2024 @ 14:41
Script: /board.php?boardid=173&sid=e014404ef494ea7b579480b378e4320a
Referer: