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 ('ac1363f605c8390d43860327581b4251','0','3.149.254.110','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715974683','formmail.php?userid=8026&sid=ac6dcd77a9059787e9f5f14e99b7696c','0','0','')
mysql error: Duplicate entry 'ac1363f605c8390d43860327581b4251' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 17.05.2024 @ 21:38
Script: /formmail.php?userid=8026&sid=ac6dcd77a9059787e9f5f14e99b7696c
Referer: