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 ('81e212730166a330961e151b524c28b9','0','18.117.81.240','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715077737','board.php?boardid=448&sid=4c2085e1e3386ec6a37a0ebfd4b1b752','0','0','')
mysql error: Duplicate entry '81e212730166a330961e151b524c28b9' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 07.05.2024 @ 12:28
Script: /board.php?boardid=448&sid=4c2085e1e3386ec6a37a0ebfd4b1b752
Referer: http://wehrbauten.de/board.php?boardid=448&sid=4c2085e1e3386ec6a37a0ebfd4b1b752