Comment 0 for bug 404289

Ubuntu 9.04 - 64 bits
Inkscape 0.47 Pre1 (previous pre-releases and development builds too)
Genius Pensketch Graphic Tablet (wizardpen driver).

I'm getting this error very frequently. I assume it's somehow related to the tablet because I never saw it in another machine with similar hardware ando no tablet.
The error pops up, and no matter how many times you close it, it pops up again, leaving no remedy than closing inkscape.
The error pops up randomly, posibly more frequently after copy and paste from another session, but I can't find a reliable way to reproduce it.
Anyway it's very frequent. It seems to appear less frequently when I restart the machine, and more frequently once it appeared.
The error seems to point about something related to py extensions, but as far as I know, the error appear during procedures completely unrelated to those extensions.

Here's the error message:

No matching node for expression: /svg:svg/@sodipodi:docname
Traceback (most recent call last):
  File "/usr/share/inkscape/extensions/gimp_xcf.py", line 173, in <module>
    e.affect()
  File "/usr/share/inkscape/extensions/inkex.py", line 198, in affect
    self.effect()
  File "/usr/share/inkscape/extensions/gimp_xcf.py", line 37, in effect
    docname = self.xpathSingle('/svg:svg/@sodipodi:docname')[:-4]
TypeError: 'NoneType' object is unsubscriptable