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 ('639028fac933249262627752a25e5c5e','0','3.149.238.159','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715805408','calendar.php?sid=9ba888709221e1a770bcd84774204955','0','0','')
mysql error: Duplicate entry '639028fac933249262627752a25e5c5e' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 15.05.2024 @ 22:36
Script: /calendar.php?sid=9ba888709221e1a770bcd84774204955
Referer: