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 ('1786e902bb0463174b8773ed53200b39','0','18.220.13.70','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715230939','calendar.php?sid=b15c3ccdcd9d94c7c0e343a1f1d6d729','0','0','')
mysql error: Duplicate entry '1786e902bb0463174b8773ed53200b39' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 09.05.2024 @ 07:02
Script: /calendar.php?sid=b15c3ccdcd9d94c7c0e343a1f1d6d729
Referer: http://wehrbauten.de/calendar.php?sid=b15c3ccdcd9d94c7c0e343a1f1d6d729