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 ('266f68fdfbe05cf2bb694d41dec1ccc7','0','18.220.126.5','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714864341','board.php?boardid=100&sid=4ce8c7414b44a5f374ab562c06bfd023','0','0','')
mysql error: Duplicate entry '266f68fdfbe05cf2bb694d41dec1ccc7' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 05.05.2024 @ 01:12
Script: /board.php?boardid=100&sid=4ce8c7414b44a5f374ab562c06bfd023
Referer: http://wehrbauten.de/board.php?boardid=100&sid=4ce8c7414b44a5f374ab562c06bfd023