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 ('4ed25a983be28a6cc58ca366f2922f24','0','18.189.2.122','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715248979','calendar.php?sid=8dfce66a8a2608a184ef2a259f0aebd1','0','0','')
mysql error: Duplicate entry '4ed25a983be28a6cc58ca366f2922f24' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 09.05.2024 @ 12:02
Script: /calendar.php?sid=8dfce66a8a2608a184ef2a259f0aebd1
Referer: http://wehrbauten.de/calendar.php?sid=8dfce66a8a2608a184ef2a259f0aebd1