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 ('a4b7a9740367214f31f5396ba19dfe56','0','3.129.211.87','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714603716','board.php?boardid=547&page=1&daysprune=1000&sortfield=views&sortorder=ASC&sid=87b0b589618df2fe08d1b4996713bc10','0','0','')
mysql error: Duplicate entry 'a4b7a9740367214f31f5396ba19dfe56' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 02.05.2024 @ 00:48
Script: /board.php?boardid=547&page=1&daysprune=1000&sortfield=views&sortorder=ASC&sid=87b0b589618df2fe08d1b4996713bc10
Referer: http://wehrbauten.de/board.php?boardid=547&page=1&daysprune=1000&sortfield=views&sortorder=ASC&sid=87b0b589618df2fe08d1b4996713bc10