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 ('31dbab19c771626e38ba4d1204817e4b','0','18.223.237.221','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715787140','formmail.php?userid=1010&sid=1445f394b2fb1126f91167c0c0d86db6','0','0','')
mysql error: Duplicate entry '31dbab19c771626e38ba4d1204817e4b' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 15.05.2024 @ 17:32
Script: /formmail.php?userid=1010&sid=1445f394b2fb1126f91167c0c0d86db6
Referer: