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 ('2a16ca41fdb0cd9f4673cc72b0013b0d','0','18.119.118.99','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715018644','board.php?boardid=136&sid=ae6e0fa91a4d96995335f250ed8cf516','0','0','')
mysql error: Duplicate entry '2a16ca41fdb0cd9f4673cc72b0013b0d' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 06.05.2024 @ 20:04
Script: /board.php?boardid=136&sid=ae6e0fa91a4d96995335f250ed8cf516
Referer: http://wehrbauten.de/board.php?boardid=136&sid=ae6e0fa91a4d96995335f250ed8cf516