Created Unassigned: Bug with group selection PowerPoint [20431]

1. Place on slide several shapes.
2. Group them.
3. Select child shape.
4. Press CTRL and select group
5. Try to enumerate Selection.ShapeRange

An exception of type 'AddinExpress.MSO.ADXExternalException' occurred. Additional information:
An error has occurred in the code of the add-in. (AddinExpress.MSO.ADXExternalException)
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See inner exception(s) for details. (System.Runtime.InteropServices.COMException)
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Exception has been thrown by the target of an invocation. (System.Reflection.TargetInvocationException)
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Exception from HRESULT: 0x800A01A8 (System.Runtime.InteropServices.COMException)

Could you help?