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PHP Noticeyii\base\ErrorException

Trying to get property 'isAdmin' of non-object

$_GET = [
    'tag' => '%D0%BA%D0%BE%D0%BB%D0%B5%D0%BD%D0%BD%D1%8B%D0%B9 %D1%81%D1%83%D1%81%D1%82%D0%B0%D0%B2',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => '/blog?tag=%25D0%25BA%25D0%25BE%25D0%25BB%25D0%25B5%25D0%25BD%25D0%25BD%25D1%258B%25D0%25B9+%25D1%2581%25D1%2583%25D1%2581%25D1%2582%25D0%25B0%25D0%25B2',
];