Just happened again after the app was closed and leads to dupe 911834. Since 
software-properties isn't opened daily by the user there is no daily report, 
but it certainly still crashes on two different machines after having it the 
first time open and then closing it.
Traceback:
 Traceback (most recent call last):
   File 
"/usr/lib/python2.7/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py",
 line 820, in on_treeview_sources_cursor_changed
     (model, iter) = sel.get_selected()
 AttributeError: 'NoneType' object has no attribute 'get_selected'

python-gobject:
  Installed: 3.1.1-0ubuntu1
  Candidate: 3.1.1-0ubuntu1
  Version table:
 *** 3.1.1-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

Dependencies in crash file say:
python-gobject 3.1.1-0ubuntu1
python-gobject-2 2.28.6-9

## Besides there is still the odd behaviour that it requests
authentication on one of two machines although the versions are the
same. bug 930972

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https://bugs.launchpad.net/bugs/905602

Title:
  software-properties-gtk crashed with AttributeError in
  _decode_value(): 'NoneType' object has no attribute 'decode'

Status in “pygobject” package in Ubuntu:
  Fix Released
Status in “pygobject” source package in Precise:
  Fix Released

Bug description:
  Tried to set the apt mirrir to "other".

  TEST CASE:
  1. Launch software-properties-gtk from a console
  2. Switch to first tab 'Ubuntu Software' if not already selected
  3. On the combobox 'Download from' select 'Other ...'

  ACTUAL RESULT:
  Traceback (most recent call last):
    File 
"/usr/lib/python2.7/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py",
 line 477, in on_combobox_server_changed
      uri = server_store.get_value(iter, 1)
    File "/usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py", line 977, in 
get_value
      return self._decode_value(treeiter, column, value)
    File "/usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py", line 803, in 
_decode_value
      value = value.decode('UTF-8')
  AttributeError: 'NoneType' object has no attribute 'decode'

  EXPECTED RESULT
  The user can proceed with the selection of another mirror.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: software-properties-gtk 0.82
  ProcVersionSignature: Ubuntu 3.2.0-5.11-generic 3.2.0-rc5
  Uname: Linux 3.2.0-5-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 1.90-0ubuntu1
  Architecture: amd64
  Date: Sat Dec 17 00:02:57 2011
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/software-properties-gtk
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20111216.1)
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk -n -t 0
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  PythonArgs: ['/usr/bin/software-properties-gtk', '-n', '-t', '0']
  SourcePackage: software-properties
  Title: software-properties-gtk crashed with AttributeError in 
_decode_value(): 'NoneType' object has no attribute 'decode'
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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