I can reproduce this using the following procedure:

1. Extensions->Colour->Custom...

2. Enter "rr" in the "Red Function:" dialog and press "Apply".  (Also
occurs if "Live Preview" is enabled).

This occurs because the "rr" symbol does not exist (i.e. it's a typo in
the entry field).  The extension script should perform more thorough
error checking on the input field before trying to process the function,
and then display a user-friendly error message rather than just throwing
an exception.


** Changed in: inkscape (Ubuntu)
   Importance: Undecided => Low

** Changed in: inkscape (Ubuntu)
       Status: New => Triaged

** Changed in: inkscape
       Status: New => Triaged

** Changed in: inkscape
   Importance: Undecided => Medium

** Tags removed: amd64
** Tags added: extensions-plugins

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https://bugs.launchpad.net/bugs/849046

Title:
  color_custom.py crashed with NameError in <string>: name 'rr' is not
  defined

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