Help me LUA - MYSQL - PHP

my lua scrypt:

    info = {Device_ID = "123456", Email = "abcde@gmail.com"}

    httpPost("link to php", info)

my code PHP:

<?php
$conn = new mysqli("localhost", "id18086435_admin", "Hoanglenin-123456","id18086435_modsw");
if($conn->connect_error != null){
die($conn->connect_error);
}
$JDecode = json_decode(file_get_contents('php://input'),true);
$ID = $JDecode["Device_ID"];
$Email = $JDecode["Email"];
$VIP = "No";
if($conn-> query("INSERT INTO Login (ID, EMAIL, VIP) VALUES (N'$ID', N'$Email', N'$VIP')")){
echo ("print('OK')");
}else{
echo ("print('fail')");
}
?>



the database doesn't add the information I send!