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 ('a9c40a30e507bfe36985902f2bc53782','0','3.21.43.192','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715467814','usercp.php?action=buddy&add=344&sid=2c5cf224d658335ef634b20ce8d9154f','0','0','')
mysql error: Duplicate entry 'a9c40a30e507bfe36985902f2bc53782' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 12.05.2024 @ 00:50
Script: /usercp.php?action=buddy&add=344&sid=2c5cf224d658335ef634b20ce8d9154f
Referer: http://wehrbauten.de/usercp.php?action=buddy&add=344&sid=2c5cf224d658335ef634b20ce8d9154f