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 ('c2f28ebe744259ddf03bb826ba5eb7ce','0','18.217.248.255','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1716198711','calendar.php?sid=f902b00517046e3fee0e65a5877a3b09','0','0','')
mysql error: Duplicate entry 'c2f28ebe744259ddf03bb826ba5eb7ce' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 4.4.9
Date: 20.05.2024 @ 11:51
Script: /board/calendar.php?sid=f902b00517046e3fee0e65a5877a3b09
Referer: