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 ('1a54a8d870d1f566c1979af2f9f0be1b','0','3.143.17.25','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715762448','calendar.php?sid=2f247b4ff42176e97b1b17351db25b18','0','0','')
mysql error: Duplicate entry '1a54a8d870d1f566c1979af2f9f0be1b' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 15.05.2024 @ 10:40
Script: /calendar.php?sid=2f247b4ff42176e97b1b17351db25b18
Referer: http://wehrbauten.de/calendar.php?sid=2f247b4ff42176e97b1b17351db25b18