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PHP Noticeyii\base\ErrorException

Trying to access array offset on value of type null

$_GET = [
    '%D0%BD%D0%BE%D0%B2%D0%BE%D1%81%D1%82%D1%8C' => '%D0%A1%D1%8A%D0%B5%D0%BC%D0%BA%D0%B0%2B%D0%BD%D0%BE%D0%B2%D0%BE%D0%B3%D0%BE%D0%B4%D0%BD%D0%B5%D0%B3%D0%BE%2B%D0%BA%D0%B0%D0%BB%D0%B5%D0%BD%D0%B4%D0%B0%D1%80%D1%8F%2B',
];