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 ('6974c5f34f45637718d5a28fe8e4f6c8','0','18.119.213.110','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715814824','usercp.php?action=buddy&add=2&sid=5f85586477e25a993d34cea2ec6cbe28','0','0','')
mysql error: Duplicate entry '6974c5f34f45637718d5a28fe8e4f6c8' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.5.62-0+deb8u1
php version: 5.6.40-0+deb8u12
Date: 16.05.2024 @ 01:13
Script: /board/usercp.php?action=buddy&add=2&sid=5f85586477e25a993d34cea2ec6cbe28
Referer: