On Thu, 22 Oct 2020 09:23:35 +0100 Colin Baxter <m43cap@yandex.com> wrote:

>>>>>> Pankaj Jangid <pankaj.jangid@codeisgreat.com> writes:
>
>     > Steps: 1. M-x epa-list-keys RET ⇒ (lists keys) 2. q 3. M-x
>     > epa-list-keys RET ⇒ Wrong type argument: interger-or-marker-p, nil
>
> Works for me using emacs-28.0.50 and emacs-27.1.

It works in emacs-27 but AFAICT it cannot work with emacs -Q from
master.  If you did use -Q with emacs-28, did you perhaps kill the
buffer is step 2 instead of typing `q'?

Here's a patch for master, but someone who knows epa.el well should
verify it: