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 ('a3fdac53f39c9a8b07b400e679a32809','0','3.14.253.152','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715141680','board.php?boardid=511&sid=cff46417fc6249817aa3c21dea179ba6','0','0','')
mysql error: Duplicate entry 'a3fdac53f39c9a8b07b400e679a32809' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 08.05.2024 @ 06:14
Script: /board.php?boardid=511&sid=cff46417fc6249817aa3c21dea179ba6
Referer: http://wehrbauten.de/board.php?boardid=511&sid=cff46417fc6249817aa3c21dea179ba6