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 ('2b398eb48ed4606e93183e242ac9fc67','0','3.147.65.65','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715127124','calendar.php?sid=d90ec0e81970076c0a81a898d6bbe64d','0','0','')
mysql error: Duplicate entry '2b398eb48ed4606e93183e242ac9fc67' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 08.05.2024 @ 02:12
Script: /calendar.php?sid=d90ec0e81970076c0a81a898d6bbe64d
Referer: http://wehrbauten.de/calendar.php?sid=d90ec0e81970076c0a81a898d6bbe64d