SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6.pl2): Invalid SQL: INSERT INTO bb1_sessions (sessionhash,userid,ipaddress,useragent,lastactivity,request_uri,styleid,langid,authentificationcode) VALUES ('e4fc7c1cc338805e005cbe23b7075a3b','0','18.188.66.13','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714947204','register.php?sid=4d3b4e7941229f3d52739bd73a6015d3','0','0','')
mysql error: Duplicate entry 'e4fc7c1cc338805e005cbe23b7075a3b' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.41
php version: 5.3.29
Date: 06.05.2024 @ 00:13
Script: /wbb2/register.php?sid=4d3b4e7941229f3d52739bd73a6015d3
Referer: