注意：尝试在第13行获取非对象的属性

Question

试图输入错误的用户名和密码来查看我的错误消息我有这个错误而不是“Identifiant ou mot de passe incorrecte” 你能帮帮我们吗？第13行

<?php
require_once 'inc/functions.php';
reconnect_from_cookie();
if(isset($_SESSION['auth'])){
    header('Location: index.php');
    exit();
}
if(!empty($_POST) && !empty($_POST['username']) && !empty($_POST['password'])){
    require_once 'inc/db.php';
    $req = $pdo->prepare('SELECT * FROM users WHERE (username = :username OR email = :username)');
    $req->execute(['username' => $_POST['username']]);
    $user = $req->fetch();
    if(password_verify($_POST['password'], $user->password)){
        $_SESSION['auth'] = $user;
$_SESSION['flash']['success'] = 'Vous êtes maintenant connecté';
if($_POST['remember']){
    $remember_token = str_random(250);
    $pdo->prepare('UPDATE users SET remember_token = ? WHERE id = ?')->execute([$remember_token, $user->id]);
    setcookie('remember', $user->id . '==' . $remember_token . sha1($user->id . 'ratonlaveurs'), time() + 60 * 60 * 24 * 7);
}
        header('Location: index.php');
        exit();
    }else{
        $_SESSION['flash']['danger'] = 'Identifiant ou mot de passe incorrecte';
    }
}
?>