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 ('991bc97ee8d136dd452181e38e1f70da','0','3.133.140.79','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1716392043','formmail.php?userid=12930&sid=7efbaccc1058434852d13d1742af1a37','0','0','')
mysql error: Duplicate entry '991bc97ee8d136dd452181e38e1f70da' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 22.05.2024 @ 17:34
Script: /formmail.php?userid=12930&sid=7efbaccc1058434852d13d1742af1a37
Referer: