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 ('5621c9e6bbf387ac7b2ac28b9cd75909','0','18.221.156.50','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715896581','newthread.php?boardid=690&sid=3684641faa613cdf6b7a307cb10547f0','0','0','')
mysql error: Duplicate entry '5621c9e6bbf387ac7b2ac28b9cd75909' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 16.05.2024 @ 23:56
Script: /newthread.php?boardid=690&sid=3684641faa613cdf6b7a307cb10547f0
Referer: http://wehrbauten.de/newthread.php?boardid=690&sid=3684641faa613cdf6b7a307cb10547f0