bug#47774: 28.0.50; crash when using minibuffer

[Gregory Heytings]

> > The crash occur when switching from one buffer to others using 
> > counsel-switch-buffer (via minibuffer). I'm wasn't doing anything 
> > special, in *scratch* buffer I was trying to figure out how to properly 
> > use fontset functions.
>
> Could you provide a backtrace?  See `C-h C-d' for information on how to 
> do that.
>
> Could you provide a recipe for reproducing it, starting from "emacs -Q"?

This looks like yet another occurrence of bug#47207.