Uncaught error upon closing Inkscape

Steps to reproduce:

I could not reproduce this a second time. I opened Inkscape, played around for a bit and closed without exiting.

What happened?

Got this error stack:

Traceback (most recent call last):
  File "dxf12_outlines.py", line 139, in <module>
    DxfTwelve().run()
  File "/Applications/Inkscape.app/Contents/Resources/share/inkscape/extensions/inkex/base.py", line 114, in run
    self.save_raw(self.effect())
  File "/Applications/Inkscape.app/Contents/Resources/share/inkscape/extensions/inkex/base.py", line 137, in save_raw
    self.save(self.options.output)
  File "dxf12_outlines.py", line 121, in save
    layer = node.getparent().label
  File "/Applications/Inkscape.app/Contents/Resources/share/inkscape/extensions/inkex/elements.py", line 122, in __getattr__
    raise AttributeError("Can't find attribute {}.{}".format(self.typename, name))
AttributeError: Can't find attribute SvgDocumentElement.label

What should have happened?

Nothing

Inkscape Version and Operating System:

• Inkscape Version: Inkscape-1.0beta2
• Operating System: MacOS
• Operating System version: 10.14.6