Comment 2 for bug 1474188

I believe I may have a very similar bug, if not the same.

Upon saving a new *optimised* SVG Document on Windows 10 (completely unedited externally), the following message appears:

Traceback (most recent call last):
  File "scour.inkscape.py", line 78, in <module>
    e.affect(output=False)
  File "C:\Program Files\Inkscape\share\extensions\inkex.py", line 265, in affect
    self.getposinlayer()
  File "C:\Program Files\Inkscape\share\extensions\inkex.py", line 207, in getposinlayer
    x = self.unittouu( xattr[0] + 'px' )
  File "C:\Program Files\Inkscape\share\extensions\inkex.py", line 351, in unittouu
    return retval * (self.__uuconv[u.string[u.start():u.end()]] / self.__uuconv[self.getDocumentUnit()])
  File "C:\Program Files\Inkscape\share\extensions\inkex.py", line 326, in getDocumentUnit
    svgunitfactor = self.__uuconv[svgwidthunit] * width / viewboxwidth
ZeroDivisionError: float division