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 ('587a35e33a66aafb5c0027767fec5a58','0','18.212.87.137','claudebot','1711661285','board.php?boardid=34&sid=53e7e90c8d4b1ca6262a346dc11cf1cb','0','0','')
mysql error: Duplicate entry '587a35e33a66aafb5c0027767fec5a58' for key 'PRIMARY'
mysql error number: 1062
mysql version: 10.1.26-MariaDB-0+deb9u1
php version: 5.3.29
Date: 28.03.2024 @ 22:28
Script: /wbb2/board.php?boardid=34&sid=53e7e90c8d4b1ca6262a346dc11cf1cb
Referer: