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 ('c52a7aa7a79ff3dbdf644778b9681fc3','0','3.137.181.52','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714664946','board.php?boardid=690&sid=3c9169e6c2bb25f18704483c2d017340','0','0','')
mysql error: Duplicate entry 'c52a7aa7a79ff3dbdf644778b9681fc3' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 02.05.2024 @ 17:49
Script: /board.php?boardid=690&sid=3c9169e6c2bb25f18704483c2d017340
Referer: http://wehrbauten.de/board.php?boardid=690&sid=3c9169e6c2bb25f18704483c2d017340