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Error

Call to a member function getQuestions() on null

$_GET = [
    'slug' => '%D0%A2%D1%80%D0%B5%D0%BD%D0%B0%D0%B6%D0%B5%D1%80%D0%BD%D1%8B%D0%B9%20%D0%B7%D0%B0%D0%BB',
];