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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%9B%D1%83%D1%87%D1%88%D0%B8%D0%B9%20%D0%B8%D0%B7%20%D0%BB%D1%83%D1%87%D1%88%D0%B8%D1%85',
];