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 ('820a724015709b77aae224930dc1ab2f','0','3.15.174.58','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715894978','newthread.php?boardid=334&sid=b9229313ab59fc1dc75ea45f430ab886','0','0','')
mysql error: Duplicate entry '820a724015709b77aae224930dc1ab2f' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 16.05.2024 @ 23:29
Script: /newthread.php?boardid=334&sid=b9229313ab59fc1dc75ea45f430ab886
Referer: http://wehrbauten.de/newthread.php?boardid=334&sid=b9229313ab59fc1dc75ea45f430ab886