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 ('3511c059793151a8f1bd28334719caeb','0','18.217.4.206','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714939742','register.php?sid=7aff5b509f7d7146608038ef019ede2f','0','0','')
mysql error: Duplicate entry '3511c059793151a8f1bd28334719caeb' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 05.05.2024 @ 22:09
Script: /register.php?sid=7aff5b509f7d7146608038ef019ede2f
Referer: http://wehrbauten.de/register.php?sid=7aff5b509f7d7146608038ef019ede2f