Attempts to select 'nil' window

[Stebalien]

I think I've finally tracked down the source of the (wrong-type-argument window-live-p nil) error I've been seeing (finally got a backtrace):

exwm/exwm.el

Line 512 in 1821027

(select-window window)))))

The cause seems pretty clear: the buffer here may not actually have a current window:

exwm/exwm.el

Lines 499 to 512 in 1821027

	(with-current-buffer buffer
	(when (eq exwm--frame exwm-workspace--current)
	(if exwm--floating-frame
	(select-frame exwm--floating-frame)
	(setq iconic (exwm-layout--iconic-state-p))
	(when iconic
	;; State change: iconic => normal.
	(set-window-buffer (frame-selected-window exwm--frame)
	(current-buffer)))
	;; Focus transfer.
	(setq window (get-buffer-window nil t))
	(when (or iconic
	(not (eq window (selected-window))))
	(select-window window)))))

get-buffer-window is probably returning nil.

[rayslava]

It seems this is the error that I get from time to time after launching Gnus.
Some windows can't get focus with this error, and switching workspaces leads to random switching to previously active windows from time to time.

Is there any fix or at least workaround for this one?