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PHP Noticeyii\base\ErrorException

Trying to get property 'isAdmin' of non-object

$_GET = [
    'tag' => 'спина',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => '/blog?tag=%D1%81%D0%BF%D0%B8%D0%BD%D0%B0',
];