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PHP Noticeyii\base\ErrorException

Trying to access array offset on value of type null

$_GET = [
    'page' => '1',
    '%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB%D1%8C' => '%D0%A1%D0%B8%D0%BB%D0%BE%D0%B2%D0%BE%D0%B9%2B%D0%BA%D0%B0%D0%B1%D0%B5%D0%BB%D1%8C',
];