SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6.pl2): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('35f6c012acbf03eaa283056697518370','0','18.220.1.239','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714912212','calendar.php?sid=256bdff70780942fc4778a265553ea6a','0','0','')
mysql error: Duplicate entry '35f6c012acbf03eaa283056697518370' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.41
php version: 5.3.29
Date: 05.05.2024 @ 14:30
Script: /wbb2/calendar.php?sid=256bdff70780942fc4778a265553ea6a
Referer: