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 ('203cb07956fe00ca83c0497d7cfd5b81','0','3.12.153.31','Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.c','1715609762','search.php?action=user&userid=523&sid=40c7a09ba01eb332c0d4310b0c1026ba','0','0','')
mysql error: Duplicate entry '203cb07956fe00ca83c0497d7cfd5b81' for key 'PRIMARY'
mysql error number: 1062
mysql version: 5.7.42-log
php version: 5.6.40
Date: 13.05.2024 @ 16:16
Script: /search.php?action=user&userid=523&sid=40c7a09ba01eb332c0d4310b0c1026ba
Referer: