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 ('fdc09de57b8d5b325ce58d084b0ca435','0','3.129.249.105','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714840502','board.php?boardid=4&sid=d768bcbc2c4e96a11b37d22d3a24ed11','0','0','')
mysql error: Duplicate entry 'fdc09de57b8d5b325ce58d084b0ca435' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.1.41-3ubuntu12.3
php version: 4.4.9
Date: 04.05.2024 @ 18:35
Script: /wbb2/board.php?boardid=4&sid=d768bcbc2c4e96a11b37d22d3a24ed11
Referer: