I made this patch from github emacs-mirror repository.
I hope this will be of help.

Thanks.

2019년 7월 13일 (토) 오후 12:42, Lars Ingebrigtsen <larsi@gnus.org>님이 작성:
SK Kim <tttuuu888@gmail.com> writes:

> This is not likely a bug but sort-numeric-fields function does not
> allow region with blank lines, while sort-lines does.
>
> This was because sort-skip-fields occurs error with blank line. And
> when I added condition for sort-skip-fields like below,
> sort-numeric-fields was working with blank lines too.
>
>                      (when (not (string-match-p "^\\s-*$" (thing-at-point 'line)))
>                        (sort-skip-fields field))
>
> So, I just hope sort-numeric-fields would work for region with blank
> lines too.

Can you create a patch for this fix?

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