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 ('e4dfcf5b5122fd7dcf3c304f31739e51','0','18.116.239.195','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714448145','markread.php?boardid=468&sid=37feafaee3bcb80809659f08ba0cebe5','0','0','')
mysql error: Duplicate entry 'e4dfcf5b5122fd7dcf3c304f31739e51' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 30.04.2024 @ 05:35
Script: /markread.php?boardid=468&sid=37feafaee3bcb80809659f08ba0cebe5
Referer: http://wehrbauten.de/markread.php?boardid=468&sid=37feafaee3bcb80809659f08ba0cebe5