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 ('434cef159dce7a055b78151689b57838','0','3.128.171.246','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715736183','formmail.php?userid=8907&sid=206c1f57ebd86938ebcad083ae89ec28','0','0','')
mysql error: Duplicate entry '434cef159dce7a055b78151689b57838' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 15.05.2024 @ 03:23
Script: /formmail.php?userid=8907&sid=206c1f57ebd86938ebcad083ae89ec28
Referer: