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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(%D0%90)-LS%204%D1%8516%20%D0%BE%D0%BA%20(N)-1',
];