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 ('7efc7ba58703a531afc951eb7a9fcdb6','0','3.138.105.255','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715554504','calendar.php?sid=3d8464d029a02e41e387b7aa69ed8cff','0','0','')
mysql error: Duplicate entry '7efc7ba58703a531afc951eb7a9fcdb6' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 13.05.2024 @ 00:55
Script: /calendar.php?sid=3d8464d029a02e41e387b7aa69ed8cff
Referer: http://wehrbauten.de/calendar.php?sid=3d8464d029a02e41e387b7aa69ed8cff