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 ('c1a54c1b7c8e9631545b51060fda8fb2','0','18.119.248.62','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715564738','calendar.php?sid=e0e7239c1dcb209021d835d5fb9f8ed0','0','0','')
mysql error: Duplicate entry 'c1a54c1b7c8e9631545b51060fda8fb2' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 13.05.2024 @ 03:45
Script: /calendar.php?sid=e0e7239c1dcb209021d835d5fb9f8ed0
Referer: http://wehrbauten.de/calendar.php?sid=e0e7239c1dcb209021d835d5fb9f8ed0