saat ingin melakukan edit, gambar selalu hilang padahal gamabar tidak pernah di edit

<?php
session_start();

if(!isset($_SESSION["login"])){
  header('Location: ../login.php');
  exit;
}
require 'koneksi.php';

$id_profil = $_GET['id_profil'];
$query = "SELECT * FROM profil WHERE id_profil = $id_profil";
$ekse = mysqli_query($koneksi, $query);
$data = mysqli_fetch_assoc($ekse);

if( isset($_POST['submit']) ) {
	$nama = $_POST['nama'];
	$nip = $_POST['nip'];
	$jabatan = $_POST['jabatan'];
	$namaFile = $_FILES['gambar']['name'];
	$tmpName = $_FILES['gambar']['tmp_name'];
	$gambarLama = $_FILES['gambar']['gambarLama'];

	$query = "UPDATE profil SET nama = '$nama', nip = '$nip', jabatan = '$jabatan', gambar = '$namaFile' WHERE id_profil = '$id_profil'";
	if(mysqli_query($koneksi, $query) ) {
		move_uploaded_file($tmpName, 'img/' . $namaFile);
		header("Location: profil_guru.php");
	}
}

?>