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 ('135e5a3ab86b8f9fbdd1d11f03ad1b6b','0','3.134.118.95','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1714715804','formmail.php?userid=38&sid=b51cbc35f88a0729edf9f1297b05081a','0','0','')
mysql error: Duplicate entry '135e5a3ab86b8f9fbdd1d11f03ad1b6b' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.41
php version: 5.3.29
Date: 03.05.2024 @ 07:56
Script: /wbb2/formmail.php?userid=38&sid=b51cbc35f88a0729edf9f1297b05081a
Referer: