Noam Postavsky <npostavs@gmail.com> writes:

> On 24 April 2018 at 21:18, Lars Ingebrigtsen <larsi@gnus.org> wrote:
>> Joseph Mingrone <jrm@ftfl.ca> writes:

>>> I did have to change the value of `epa-pinentry-mode' to 'loopback to
>>> get prompted for a passphrase when opening an encrypted file.  But,
>>> when sending messages in Gnus with `mml-secure-message-sign', instead
>>> of being prompted for the passphrase, a 'Wrong type argument:
>>> char-or-string-p, nil' error is reported, which I believe occurs in or
>>> around `mml-compute-boundary'.

>> Please (setq debug-on-error t) to get a backtrace and report this bug
>> with `M-x report-emacs-bug'.

> Isn't this Bug#26298?

This does describe what I am seeing.  Thanks and apologies for missing it before posting here.

Joseph