laravel 5.4 count（）函数错误

I am using laravel 5.4, there is an error in the code below,
but there is no error when using laravel 5.3,
why is it?

controller:

public function index()
{
    $user=\Auth::user();
    $articles=$user->articles;

    return view('index',  compact('user','articles'));
}

view:

{{ $articles->count() }}

error:

Call to a member function count() on null

what should I do?

Change it to count($articles). ->count() on a null value produces indeed an error.

Laravel 5.4 you should try:

{{ count($articles) }}