Traceback (most recent call last):
  File "/usr/share/inkscape/extensions/motion.py", line 116, in <module>
    e.affect()
  File "/usr/share/inkscape/extensions/inkex.py", line 157, in affect
    self.effect()
  File "/usr/share/inkscape/extensions/motion.py", line 79, in effect
    s = node.attributes.getNamedItem('style').value
AttributeError: 'NoneType' object has no attribute 'value'