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PHP Noticeyii\base\ErrorException

Trying to get property 'isAdmin' of non-object

$_GET = [
    'tag' => 'позвоночник',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => '/blog?tag=%D0%BF%D0%BE%D0%B7%D0%B2%D0%BE%D0%BD%D0%BE%D1%87%D0%BD%D0%B8%D0%BA',
];