Can't get model relation in artisan custom command Laravel 5.4

I created an artisan custom command and in the handle() method i need to get a few info about users.

When i run:

handle() {
   $users = User::all();
   foreach($users as $user) {
      $this->line($user->name);
   }
}

it works, but i need something like:

handle() {
   $users = User::all();
   foreach($users as $user) {
      $this->line($user->phone->number);
   }
}

And i get Trying to get property of non-object.

If i run the same code above in a controller it works just fine.

Does anyone have an idea?

via Felipe Martins