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PHP Noticeyii\base\ErrorException

Trying to get property 'isAdmin' of non-object

$_GET = [
    'tag' => '%D1%83%D1%80%D0%BE%D0%BA%D0%B8',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => '/blog?tag=%25D1%2583%25D1%2580%25D0%25BE%25D0%25BA%25D0%25B8',
];