fontifying region ...(wrong-type-argument nil)

[Fred DeCaro]

Get this error:
   fontifying region ...(wrong-type-argument nil)
a lot. I am using XEmacs 21.4 with Cygwin on a PC.

Below is backtrace:

Signaling: (error "Not over a window.")
  signal(error ("Not over a window."))
  cerror("Not over a window.")
  apply(cerror "Not over a window." nil)
  error("Not over a window.")
  mouse-track(#<buttondown-event button1>)
  call-interactively(mouse-track)



	
		
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