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 ('4f9df3d9ff93a9aff9fda23940fadae4','0','3.129.69.189','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715845383','calendar.php?sid=78bf09d5d62a4a600f7935b68a13a955','0','0','')
mysql error: Duplicate entry '4f9df3d9ff93a9aff9fda23940fadae4' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 16.05.2024 @ 09:43
Script: /calendar.php?sid=78bf09d5d62a4a600f7935b68a13a955
Referer: