[PHP Notice]Undefined index: QUERY_STRING

  • Hi,

    There’s a PHP Notice showing up when no query strings are present in URL.
    You can replace line counter-core.php#L578
    if (strpos($_SERVER['QUERY_STRING'], 'cpd_metaboxes') !== false )
    by
    if (strpos($_SERVER['QUERY_STRING'] ?? '', 'cpd_metaboxes') !== false )

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