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PHP Noticeyii\base\ErrorException

Trying to get property 'isAdmin' of non-object

$_GET = [
    'tag' => 'голень',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => '/blog?tag=%D0%B3%D0%BE%D0%BB%D0%B5%D0%BD%D1%8C',
];