Где ошибка в коде?

Здравствуйте. Как-то не выходит найти ошибку в коде, помогите по возможности пожалуйста.

Ошибка: 

A PHP Error was encountered
Severity: Notice

Message: Trying to get property 'joy' of non-object

Filename: models/Films_model.php

Line Number: 20

Backtrace:

File: C:\xampp\htdocs\kinomonster\application\models\Films_model.php
Line: 20
Function: _error_handler

File: C:\xampp\htdocs\kinomonster\application\controllers\Movies.php
Line: 13
Function: getFilms

File: C:\xampp\htdocs\kinomonster\index.php
Line: 315
Function: require_once

Мой код из Movies:

<?php 

defined('BASEPATH') OR exit('No direc script access allowed');

class Movies extends MY_Controller {

	public function __construct() {
		parent::__construct();
	}

	public function view($slug = NULL) {

		$movie_slug = $this->films_model->getFilms($slug, false, false);

		if(empty($movie_slug)) {
			show_404();
		}

		$this->data['title'] = $movie_slug['name'];

		$this->load->view('templates/header', $this->data);
		$this->load->view('movies/view', $this->data);
		$this->load->view('templates/footer');


	}

}

Мой код из Films_Model:

<?php 

class Films_model extends CI_Model {

	public function __construct() {
		$this->load->database();
	}

	public function getFilms($slug = FALSE, $limit, $type = 1) {
		if($slug === FALSE) {
			$query = $this->db
				->where('category_id', $type)
				->order_by('add_date', 'desc')
				->limit($limit)
				->get('movie');

			return $query->result_array();
		}

		$query = $this->db->get_where('movie', array('slug'->$slug));
		return $query->row_array();
	}

	public function getFilmsByRating($limit) {
		$query = $this->db
			->order_by('rating', 'desc')
			->where('category_id', 1)
			->where('rating>', 0)
			->limit($limit)
			->get('movie');

		return $query->result_array();
	}

}