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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%93%D1%83%D0%B1%D0%B5%D1%80%D0%BD%D0%B0%D1%82%D0%BE%D1%80%2B%D0%98%D0%B2%D0%B0%D0%BD%D0%BE%D0%B2%D1%81%D0%BA%D0%BE%D0%B9%2B%D0%BE%D0%B1%D0%BB%D0%B0%D1%81%D1%82%D0%B8%2B%D0%BF%D0%BE%D1%81%D0%B5%D1%82%D0%B8%D0%BB%2B%D0%98%D0%B2%D0%B0%D0%BD%D0%BE%D0%B2%D1%81%D0%BA%D0%B8%D0%B9%2B%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB%D1%8C%D0%BD%D1%8B%D0%B9%2B%D0%B7%D0%B0%D0%B2%D0%BE%D0%B4',
];