🚀 go-pugleaf

I recently installed 18.53 on our systems and have just run into a problem
with emacstool.
	I invoke emacstool
	Use right mouse button to bring up mouse menu
	select "mouse help -> text region" from mouse menu
	use right button in text window or menu boundary to make menu go away
	
	Emacs crashes : minibuffer says "fatal error (6)."

Shelltool window from which I invoked emacstool says:

/usr/local/gnuemacs/etc/emacstool
A tty window has exited because its child exited.
Its child's process id was 1393 and it died due to signal 6 and left a core dump.

Does this suggest any known problem/bug or oversight on my part.

The problem occurs on either Sun 3/60 or 4/60 running SunOS 4.0.3.