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 ('15540cc61573a1e694a4690dcf340604','0','18.220.1.239','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714925110','board.php?boardid=631&sid=94f483d100fe1071477f6182e0415386','0','0','')
mysql error: Duplicate entry '15540cc61573a1e694a4690dcf340604' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.6.13
php version: 7.4.33
Date: 05.05.2024 @ 18:05
Script: /board.php?boardid=631&sid=94f483d100fe1071477f6182e0415386
Referer: