Auth::user() Trying to get property of non-object when test REST API from postman

When I am testing my REST API from postman, it gives me error "Trying to get property of non-object". Because there is no session in postman. If there is browser then session is created but not in postman. Can anyone give alternate solutions of Auth::user()

This is my route

Route::post('playlist/{id}/follow', 'PlaylistController@follow');

This is my code snippet.

public function follow($id)
{
     $user = $this->model->findOrFail($id);
     if ($user->id != Auth::user()->id) {
          Auth::user()->followedUsers()->attach($id);
     }
}

via Rahul Chauhan