SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6 pl2): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('cef18378a2192cdad8537207a6431906','0','3.16.81.94','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715063920','thread.php?postid=5752','0','0','')
mysql error: Duplicate entry 'cef18378a2192cdad8537207a6431906' for key 'PRIMARY'
mysql error number: 1062
mysql version: 8.0.11
php version: 5.6.10
Date: 07.05.2024 @ 08:38
Script: /thread.php?postid=5752
Referer: