I think this is causing brokenness in some cases. STR:

1. Open the Windows Store app.
2. Tab to the Search box and enter a query. I entered: wolfram
3. Press enter.

NVDA now says "list" and throws an unhandled exception. Pressing NVDA+tab to report the focus also throws an exception. Log fragment:

IO - speech.speak (17:01:33.454):
Speaking [u'list']
ERROR - eventHandler.executeEvent (17:01:33.457):
error executing event: gainFocus on <NVDAObjects.UIA.ComboBoxWithoutValuePattern object at 0x07BEDD10> with extra args of {}
Traceback (most recent call last):
  File "eventHandler.pyc", line 143, in executeEvent
  File "eventHandler.pyc", line 91, in __init__
  File "eventHandler.pyc", line 98, in next
  File "C:\Users\jamie\AppData\Roaming\nvda\addons\wintenApps\globalPlugins\wintenObjs\__init__.py", line 295, in event_gainFocus
  File "eventHandler.pyc", line 98, in next
  File "C:\Users\jamie\AppData\Roaming\nvda\addons\remote\globalPlugins\remoteClient\__init__.py", line 341, in event_gainFocus
  File "eventHandler.pyc", line 98, in next
  File "NVDAObjects\__init__.pyc", line 908, in event_gainFocus
  File "NVDAObjects\__init__.pyc", line 820, in reportFocus
  File "speech.pyc", line 354, in speakObject
  File "speech.pyc", line 270, in speakObjectProperties
  File "baseObject.pyc", line 34, in __get__
  File "baseObject.pyc", line 110, in _getPropertyViaCache
  File "NVDAObjects\UIA\__init__.pyc", line 1413, in _get_value
AttributeError: 'NoneType' object has no attribute 'GetCurrentSelection'
IO - inputCore.InputManager.executeGesture (17:01:34.625):
Input: kb(desktop):NVDA+f1
INFO - globalCommands.GlobalCommands.script_navigatorObject_devInfo (17:01:35.249):
Developer info for navigator object:
name: u'Type filter All types selected'
role: ROLE_COMBOBOX
states: STATE_FOCUSABLE, STATE_COLLAPSED, STATE_FOCUSED
isFocusable: True
hasFocus: True
Python object: <NVDAObjects.UIA.ComboBoxWithoutValuePattern object at 0x07BEDD10>
Python class mro: (<class 'NVDAObjects.UIA.ComboBoxWithoutValuePattern'>, <class 'NVDAObjects.UIA.UIA'>, <class 'NVDAObjects.window.Window'>, <class 'NVDAObjects.NVDAObject'>, <class 'baseObject.ScriptableObject'>, <class 'baseObject.AutoPropertyObject'>, <type 'object'>)
description: u'Collapsed'
location: (89, 167, 403, 65)
value: exception: 'NoneType' object has no attribute 'GetCurrentSelection'
appModule: <'winstore_app' (appName u'winstore_app', process ID 11940) at address 7b207b0>
appModule.productName: u'Windows Store'
appModule.productVersion: u'11705.1000.118.0'
TextInfo: <class 'NVDAObjects.NVDAObjectTextInfo'>
windowHandle: 2499228
windowClassName: u'Windows.UI.Core.CoreWindow'
windowControlID: 0
windowStyle: 1409286144
windowThreadID: 10800
windowText: u'Store'
displayText: u''
UIAElement: <POINTER(IUIAutomationElement) ptr=0xb00f748 at 7c003f0>
UIA automationID: _dropDownComboBoxmediaType
UIA frameworkID: XAML
UIA runtimeID: (42, 2499228, 3, 46)
UIA providerDescription: [pid:11940,providerId:0x0 Main(parent link):Unidentified Provider (unmanaged:Windows.UI.Xaml.dll)]
UIA className: GridViewItem

Hi,
Confirmed and caught, some lists raise AttributeError. For this case, catch this one first in addition to COM Error. Fix just committed. Thanks.