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PHP Noticeyii\base\ErrorException

Trying to get property 'isAdmin' of non-object

$_GET = [
    'tag' => '%D1%80%D0%B0%D0%B7%D0%BC%D1%8B%D1%88%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => '/blog?tag=%25D1%2580%25D0%25B0%25D0%25B7%25D0%25BC%25D1%258B%25D1%2588%25D0%25BB%25D0%25B5%25D0%25BD%25D0%25B8%25D1%258F',
];