Problème sur le Tuto Espace membre (refactorisation)

Bonjour à vous tous,

Voila je rencontre un petit problème avec mon code.

<?php
class Auth{

    private $options = [
        'restriction_msg' => "Vous n'avez pas le droit d'accéder à cette page"
    ];
    private $session;

    public function __construct($session, $options = []){
        $this->options = array_merge($this->options, $options);
        $this->session = $session;
    }

    public function hashPassword($password){
        return password_hash($password, PASSWORD_BCRYPT);
    }

    public function register($db, $username, $password, $email){
        $password = $this->hashPassword($password);
        $token = Str::random(60);
        $db->query("INSERT INTO users SET username = ?, password = ?, email = ?, confirmation_token = ?", [
            $username,
            $password,
            $email,
            $token
        ]);
        $user_id = $db->lastInsertId();
        mail($email, 'Confirmation de votre compte', "Afin de valider votre compte merci de cliquer sur ce lien\n\nhttp://local.dev/Lab/Comptes/confirm.php?id=$user_id&token=$token");
    }

    public function confirm($db, $user_id, $token){
        $user = $db->query('SELECT * FROM users WHERE id = ?', [$user_id])->fetch();
        if($user && $user->confirmation_token == $token ){
            $db->query('UPDATE users SET confirmation_token = NULL, confirmed_at = NOW() WHERE id = ?', [$user_id]);
            $this->session->write('auth', $user);
            return true;
        }
        return false;
    }

    public function restrict(){
        if(!$this->session->read('auth')){
            $this->session->setFlash('danger', $this->options['restriction_msg']);
            header('Location: login.php');
            exit();
        }
    }

    public function user(){
        if(!$this->session->read('auth')){
            return false;
        }
        return $this->session->read('auth');
    }

    public function connect($user){
        $this->session->write('auth', $user);
    }

    public function connectFromCookie($db){
        if(isset($_COOKIE['remember']) && !$this->user()){
            $remember_token = $_COOKIE['remember'];
            $parts = explode('==', $remember_token);
            $user_id = $parts[0];
            $user = $db->query('SELECT * FROM users WHERE id = ?', [$user_id])->fetch();
            if($user){
                $expected = $user_id . '==' . $user->remember_token . sha1($user_id . 'ratonlaveurs');
                if($expected == $remember_token){
                    $this->connect($user);
                    setcookie('remember', $remember_token, time() + 60 * 60 * 24 * 7);
                } else{
                    setcookie('remember', null, -1);
                }
            }else{
                setcookie('remember', null, -1);
            }
        }
    }

    public function login($db, $username, $password, $remember = false){
        $user = $db->query('SELECT * FROM users WHERE (username = :username OR email = :username) AND confirmed_at IS NOT NULL', ['username' => $username])->fetch();
        if(password_verify($password, $user->password)){
            $this->connect($user);
            if($remember){
                $this->remember($db, $user->id);
            }
            return $user;
        }else{
            return false;
        }
    }

    public function remember($db, $user_id){
        $remember_token = Str::random(250);
        $db->query('UPDATE users SET remember_token = ? WHERE id = ?', [$remember_token, $user_id]);
        setcookie('remember', $user_id . '==' . $remember_token . sha1($user_id . 'ratonlaveurs'), time() + 60 * 60 * 24 * 7);

    }

    public function logout(){
        setcookie('remember', NULL, -1);
        $this->session->delete('auth');
    }

    public function resetPassword($db, $email){
        $user = $db->query('SELECT * FROM users WHERE email = ? AND confirmed_at IS NOT NULL', [$email])->fetch();
        if($user){
            $reset_token = Str::random(60);
            $db->query('UPDATE users SET reset_token = ?, reset_at = NOW() WHERE id = ?', [$reset_token, $user->id]);
            mail($_POST['email'], 'Réinitiatilisation de votre mot de passe', "Afin de réinitialiser votre mot de passe merci de cliquer sur ce lien\n\nhttp://local.dev/Lab/Comptes/reset.php?id={$user->id}&token=$reset_token");
            return $user;
        }
        return false;
    }

    public function checkResetToken($db, $user_id, $token){
        return $db->query('SELECT * FROM users WHERE id = ? AND reset_token IS NOT NULL AND reset_token = ? AND reset_at > DATE_SUB(NOW(), INTERVAL 30 MINUTE)', [$user_id, $token])->fetch();
    }

}

Ha j'ai toujours le même probème
Notice: Trying to get property of non-object in C:\MAMP\PHP\GrafikArt\Espace membre\SouloufXYZ\membres\class\Auth.php on line 82

J'ai même utilisé le fichier du code source et toujours le même problème.quelqu'un aurait une solution s'il vous plait ?