Facebook app showing null reference exception

Question

I tried out this sample facebook app using MVC,

http://www.asp.net/mvc/tutorials/mvc-4/aspnet-mvc-facebook-birthday-app

I encountered null reference exception at,

public class HomeController : Controller
{
    [FacebookAuthorize("email", "friends_birthday")]
    public async Task<ActionResult> Index(FacebookContext context)
    {
        if (ModelState.IsValid)
        {
            var user = await context.Client.GetCurrentUserAsync<MyAppUser>();
            var friendsWithUpcomingBirthdays = user.Friends.Data.OrderBy(friend =>
            {
               //some code
          } 
          }
          }
          }   

null reference exception at

      var friendsWithUpcomingBirthdays = user.Friends.Data.OrderBy(friend =>

The FB account I used to develop this app has added no friends yet,

Is that the problem?.. because this method

             await context.Client.GetCurrentUserAsync<MyAppUser>();    

returned friend--"null",

Is it the reason for it to throw null reference exception at that line?

Answer 1

In found out the solution,

Its because there is no friend in that fb account.

I added a friend I tested, It worked fine.