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 ('6b6b8f8c6e6991d3f906fd2827b441cd','0','3.129.92.147','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715790130','board.php?boardid=271&sid=c64ad4bf028bd3b93b225897a5eda747','0','0','')
mysql error: Duplicate entry '6b6b8f8c6e6991d3f906fd2827b441cd' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 15.05.2024 @ 18:22
Script: /board.php?boardid=271&sid=c64ad4bf028bd3b93b225897a5eda747
Referer: http://wehrbauten.de/board.php?boardid=271&sid=c64ad4bf028bd3b93b225897a5eda747