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 ('81d9c291aa2eb96539f7d787bd73c6e8','0','18.219.189.247','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714741289','thread.php?threadid=1405&sid=f81632d7a41edaa7ccb4f2855e63f5b3','0','0','')
mysql error: Duplicate entry '81d9c291aa2eb96539f7d787bd73c6e8' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 03.05.2024 @ 15:01
Script: /thread.php?threadid=1405&sid=f81632d7a41edaa7ccb4f2855e63f5b3
Referer: