SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('d251b688d1959ba94f8be1025ece465c','0','3.21.104.72','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715608711','board.php?boardid=257&sid=03f18a1fa9b7c209cca4941d09a7c128','0','0','')
mysql error: Duplicate entry 'd251b688d1959ba94f8be1025ece465c' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 13.05.2024 @ 15:58
Script: /board.php?boardid=257&sid=03f18a1fa9b7c209cca4941d09a7c128
Referer: http://wehrbauten.de/board.php?boardid=257&sid=03f18a1fa9b7c209cca4941d09a7c128