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 ('12ffb1fc39e5abe376f67edbc391a389','0','3.145.21.205','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1716982323','register.php?sid=cab1f5ad0ff5e505d0bcf51577784ba9','0','0','')
mysql error: Duplicate entry '12ffb1fc39e5abe376f67edbc391a389' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 29.05.2024 @ 13:32
Script: /register.php?sid=cab1f5ad0ff5e505d0bcf51577784ba9
Referer: