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PHP Warningyii\base\ErrorException

Attempt to read property "title" on null

$_GET = [
    'id' => 'forums/topic/u4-%D1%84%D0%B8%D0%BB%D1%8C%D0%BC%D0%BE%D0%BA%D0%BE%D0%BF%D0%B8%D1%8F-%D0%BF%D1%80%D0%B8%D1%89%D1%83%D1%80%D0%B8%D0%B2%D0%B0%D1%82%D1%8C%D1%81%D1%8F-a-k-u/website-launched',
];