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 ('ac78b2f700bcbcd46c30dbc479d5e064','0','3.142.124.252','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715367191','calendar.php?sid=da88c56493657e8c766397c616faecd9','0','0','')
mysql error: Duplicate entry 'ac78b2f700bcbcd46c30dbc479d5e064' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 10.05.2024 @ 20:53
Script: /calendar.php?sid=da88c56493657e8c766397c616faecd9
Referer: