SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: INSERT INTO bb2_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('81991eb462a7f0a7e9979a2543dca98f','0','3.137.161.222','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714517438','profile.php?userid=8273&sid=103d265bd70a5fd0be28248974092ee4','0','0','')
mysql error: Duplicate entry '81991eb462a7f0a7e9979a2543dca98f' for key 1
mysql error number: 1062
mysql version: 4.1.22-standard
php version: 5.3.29-1+hw8
Date: 30.04.2024 @ 18:50
Script: /wbb2/profile.php?userid=8273&sid=103d265bd70a5fd0be28248974092ee4
Referer: