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 ('6b35fbc1efafbe3d0faacdf1a4e3bfb4','0','3.141.199.122','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715674195','formmail.php?userid=1&sid=8a23e5158fb91e09b0c1056d6f517be2','0','0','')
mysql error: Duplicate entry '6b35fbc1efafbe3d0faacdf1a4e3bfb4' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 14.05.2024 @ 10:09
Script: /formmail.php?userid=1&sid=8a23e5158fb91e09b0c1056d6f517be2
Referer: http://wehrbauten.de/formmail.php?userid=1&sid=8a23e5158fb91e09b0c1056d6f517be2