Wrong type argument: frame-live-p, #<dead frame *Group* 0x91ca460>

[lsilvapereyra]

Dear Emacs users,

I'm using "GNU Emacs 23.0.60.1 (i686-pc-linux-gnu, GTK+ Version
2.12.9) of 2008-11-06". I think this is not a bug. I have a simple
function:

(defun kill-this-buffer-and-frame ()
   (interactive)
   (kill-this-buffer)
   (delete-frame))

It works as intended (that is, it kills the buffer and deletes the
frame) most of the time, but sometimes (I haven't been able to
determine when) I get:

Wrong type argument: frame-live-p, #<dead frame *Group* 0x91ca460>

and it doesn't work. I'd be very grateful for any help or commentary.

Regards,
luis