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PHP Noticeyii\base\ErrorException

Trying to access array offset on value of type null

$_GET = [
    '%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB%D1%8C' => '%D0%92%D0%92%D0%93%D0%BD%D0%B3%28%D0%90%29-FRLSLTx%2B%2B2%D1%8516%2B%D0%BE%D0%BA%2B%28N%29-0,66%2B%D0%B2/%D0%BE%2B',
];