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 ('d4bb74f9e2358a6d0fdb3b691b9f56eb','0','18.188.111.130','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715703930','calendar.php?sid=e6d92f39446ff07bcef7826448429dfc','0','0','')
mysql error: Duplicate entry 'd4bb74f9e2358a6d0fdb3b691b9f56eb' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 14.05.2024 @ 18:25
Script: /calendar.php?sid=e6d92f39446ff07bcef7826448429dfc
Referer: http://wehrbauten.de/calendar.php?sid=e6d92f39446ff07bcef7826448429dfc