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 ('c3dce1fc21356b431ada71e3cdb4f93c','0','18.222.96.135','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715627944','calendar.php?sid=562e19862a18834f442780f5af8b2361','0','0','')
mysql error: Duplicate entry 'c3dce1fc21356b431ada71e3cdb4f93c' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 13.05.2024 @ 21:19
Script: /calendar.php?sid=562e19862a18834f442780f5af8b2361
Referer: