When processing a series of files in script-fu,
I'm trying to do the following:

for each file name:
  Create an image by reading it in.
    (set! orgImg (car (file-ufraw-load ...
  Create another image by duplicating the input image and manipulating it.
    (set! newImg (car (gimp-image-duplicate orgImg)))
    (gimp-image-scale newImg wid ht)
    (plug-in-unsharp-mask RUN-NONINTERACTIVE newImg newImg ...
  Write the new image out.
    (file-jpeg-save ... newImg ...
  Since I'm done with the newly created image, I did a
    (gimp-image-delete newImg)

Continuing on, 
if I try to re-use that variable to create another image
from the original image
and try to manipulate it, I get an error after a bit:

    (set! newImg (car (gimp-image-duplicate orgImg)))    ; doesn't complain
    (gimp-image-scale newImg wid ht)                     ; doesn't complain
    (plug-in-unsharp-mask RUN-NONINTERACTIVE newImg newImg ...
  Error: Procedure execution of plug-in-unsharp-mask failed on invalid input 
arguments: Procedure 'plug-in-unsharp-mask' has been called with an invalid ID 
for argument 'drawable'. Most likely a plug-in is trying to work on a layer 
that doesn't exist any longer. 

If I comment out the 
it works fine.

Can someone explain to me what is going on?
(Using gimp 2.6)


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