AttributeError: 'NoneType' object has no attribute 'get_selected'

I consistently see an error when committing:

/usr/lib/python2.7/dist-packages/gobject/constants.py:24: Warning: g_boxed_type_register_static: assertion `g_type_from_name (name) == 0' failed
  import gobject._gobject
Traceback (most recent call last):
  File "/home/curtis/.bazaar/plugins/gtk/commit.py", line 570, in _on_treeview_files_cursor_changed
    (model, selection) = treeselection.get_selected()
AttributeError: 'NoneType' object has no attribute 'get_selected'

The commit is successful, maybe this error is happening when the window is being torn down.
The method exist early if there is no selection. The method could also exit early if there is notreeselection