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PHP Warningyii\base\ErrorException

Attempt to read property "title" on null

$_GET = [
    'id' => 'forums/topic/f4-%D1%82%D0%B0%D0%BA%D1%81%D0%B8-5-%D0%BE%D0%BD%D0%BB%D0%B0%D0%B9%D0%BD-%D1%81%D0%BC%D0%BE%D1%82%D1%80%D0%B5%D1%82%D1%8C-%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE-2018-%D0%B1%D0%B8%D0%B3/website-launched',
];