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 ('c9ade325b5a723d1a8a818bf9ec67d5e','0','18.226.98.166','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715608712','thread.php?threadid=2457&sid=3dbb6795455c344b009f4e3fa6bbe4c5','0','0','')
mysql error: Duplicate entry 'c9ade325b5a723d1a8a818bf9ec67d5e' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 13.05.2024 @ 15:58
Script: /thread.php?threadid=2457&sid=3dbb6795455c344b009f4e3fa6bbe4c5
Referer: http://wehrbauten.de/thread.php?threadid=2457&sid=3dbb6795455c344b009f4e3fa6bbe4c5