Laravel 5.1 + Angularjs: Show method

I have updated my view for displaying data - projects, with angularjs and now i have problem that when i change in URL address id of project, method show() didn't show 404 error - project does not belongs to logged in user, instead i'm getting this error.

Trying to get property of non-object (View: C:\www\htdocs\laravel\resources\views\backend\partials\project\single-project.blade.php)

Before i've updated my view to work with angularjs everything was working fine.

My angular controller:

freelo.controller('mainCtrl', ['$scope', '$http', function($scope, $http) {

$scope.projects = [];
$http.get('api/userProjects')
    .then(function(response) {
        $scope.projects = response.data;
    });

}]);

My app.js:

var freelo = angular.module('freelo', []);

Method for retrieving user projects:

public function getProjectsInJson(){
    $project = Project::where('user_id', '=', $this->getCurrentUserId())->get();

    return response()->json($project);
}

And my show() method in ProjectsController:

public function show($id){
    $project = Project::where('id', $id)
                        ->where('user_id', '=', $this->getCurrentUserId())
                        ->first();
    $user = DB::table('projects')
        ->join('users', 'projects.user_id', '=', 'users.id')
        ->join('profiles', 'users.id', '=', 'profiles.user_id')
        ->select('users.id','profiles.username')
        ->where('projects.id','=', $id)
        ->get();

    if(!$project && !$user){
        abort(404);
    }else{
        return view('backend.partials.project.single-project')->with('project', $project)->with('user', $user);
    }
}

Where did i make mistake or what must be changed?

via Chebli Mohamed