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 ('a65c97b75fdf7b30ef2fe7d7cc53cae3','0','18.116.239.195','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714313883','calendar.php?sid=5b2881c43bc16e669d18413b64b6bed1','0','0','')
mysql error: Duplicate entry 'a65c97b75fdf7b30ef2fe7d7cc53cae3' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 28.04.2024 @ 16:18
Script: /calendar.php?sid=5b2881c43bc16e669d18413b64b6bed1
Referer: