phpss error : A database query failed (Query was 'INSERT INTO phpss_ip (ip) VALUES ('18.222.251.131')', MySQL said: Duplicate entry '18.222.251.131' for key 'ip')

Error received from module 'mysql' (type 'database')

Error occured in file W:\www\_phpss\modules\database\mysql.php somewhere around line 87

Error call backtrace: