php session 'user' variable is blank

[kdog5836]

<?php
include("config.php");
session_start();
$error='';
if($_SERVER["REQUEST_METHOD"] == "POST") {

// username and password sent from form
$email = mysqli_real_escape_string($db,$_POST['email']);
$pass = mysqli_real_escape_string($db,$_POST['pass']);
$sql = "SELECT * FROM users WHERE email = '$email' and pass = '$pass'";
$result = mysqli_query($db,$sql);
$row = mysqli_num_rows($result);
$count = mysqli_num_rows($result);
if($count == 1) {

// register session variables
$_SESSION['email'] = $email;
$user= $row['user'];
$_SESSION['user'] = $user;
header("location: chatroom.php");
} else {
$error = "Your Email or Password is invalid";
}
}
?>