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From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: gnus-search-engine set to gnus-search-notmuch and refer threads
Date: Wed, 15 Dec 2021 09:41:34 -0800
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References: <87lf1k11ed.fsf@onenetbeyond.org> <877dd4rmof.fsf@gnus.jao.io>
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dal-blazej@onenetbeyond.org writes:

> To be sure I upgraded both softwares :
>
> emacs-version 29.0.50
> notmuch 0.34.2+35~ged03bab
>
>
> Maybe my first mail was a bit confuse ?
>
> To reproduce the issue :
>
> 1. In the *server* buffer, use `gnus-group-read-ephemeral-search-group'
> with the query "from:jao@gnu.org" 
>
> 2. The first search succeed ; *in the ephemeral search buffer*, now use
> `gnus-summary-refer-thread' on an article. I get: 
> (wrong-type-argument listp "")

Thanks for keeping up with this. I can't immediately reproduce this.
What's your value of `gnus-refer-thread-use-search'?