Data tidak ter input di database dan tidak ada pesan eror

Koneksi ke database berhasil tidak ada eror namun waktu data diinput melalui php , data tidak terrecord di database index.php

<form class="nominal" method="post" action="input-aksi.php" >

	<p>Address Ethreum</p>
	<input type="text" name="address" placeholder="ETH Address" />
	<p>Jumlah</p>
	<input type="text" name="Nominal" placeholder="Jumlah IDR" />
	<p>Pembayaran</p>
	<input type="text" name="pembayaran" placeholder="Masukan Voucher/Nama E-Wallet" />
<p>Metode Pembayaran</p>
    <div class="switch-field">
		<input type="radio" id="radio-three" name="metode" value="indodax" onclick="tampil_alamat(1);" />
        <label for="radio-three">Indodax</label>
        <input type="radio" id="radio-four" name="metode" value="dana" onclick="tampil_alamat(2)" />
        <label for="radio-four">DANA</label>
        <input type="radio" id="radio-five" name="metode" value="ovo" onclick="tampil_alamat(3)"/>
        <label for="radio-five">OVO</label>
		<input type="radio" id="radio-six" name="metode" value="bca" onclick="tampil_alamat(4)"/>
        <label for="radio-six">BCA</label>
    </div>
<div>
	<input type="submit" value="Simpan" />


</div>
</form>

koneksi.php

<?php
$db_host = "localhost";
$db_user = "root";
$db_pass = "";
$db_name = "pusatcrypto";

$koneksi = mysqli_connect($db_host, $db_user, $db_pass, $db_name);

if(mysqli_connect_errno()){
	echo 'Gagal melakukan koneksi ke Database : '.mysqli_connect_error();
}else{
	echo 'Koneksi berhasil ^_^';
}
?>

input-aksi.php

<?php
include 'koneksi.php';
$address = $_POST['address'];
$Nominal = $_POST['Nominal'];
$pembayaran = $_POST['pembayaran'];
$metode = $_POST['metode'];

mysqli_query("INSERT INTO eth VALUES('','$address','$Nominal','$pembayaran','$metode')");

header("location:index.php?pesan=input");
?>

kira kira dimananya ya yang salah hehe maaf pemula sudah search di google tetap tidak teratasi