Error saving as optimised SVG

[Martin]

I have created a file and saved it as simple SVG. The file is attached

Now I want to save it as optimised SVG (running v0.91 on Ubuntu 14.04LTS)
I get the following error, and nothing is saved:
Traceback (most recent call last):
  File "scour.inkscape.py", line 78, in <module>
    e.affect(output=False)
  File "/usr/share/inkscape/extensions/inkex.py", line 265, in affect
    self.getposinlayer()
  File "/usr/share/inkscape/extensions/inkex.py", line 207, in getposinlayer
    x = self.unittouu( xattr[0] + 'px' )
  File "/usr/share/inkscape/extensions/inkex.py", line 351, in unittouu
    return retval * (self.__uuconv[u.string[u.start():u.end()]] / self.__uuconv[self.getDocumentUnit()])
  File "/usr/share/inkscape/extensions/inkex.py", line 304, in getDocumentUnit
    p = param.match(svgwidth)
TypeError: expected string or buffer
I get the same error running under Windows 7 Pro

[Martin (mknapp1952)]

I changed the dimensions of the page from 48x48px to 50x50px... and the problem seems to have gobe away!

[su_v (suv-lp)]

Known issue in Inkscape 0.91 with SVG files which lack width and height attributes for the root <svg> element, already tracked in
* Bug #1463623 “Error trying to save Optimized SVG (no 'width' attribute for SVGRoot)”
  https://bugs.launchpad.net/inkscape/+bug/1463623
* Bug #1461346 “getposinlayer fails if height attribute is missing”
  https://bugs.launchpad.net/inkscape/+bug/1461346

Linking as duplicate to bug #1463623.