GetBasicPropertiesAsync throws InvalidOperationException in WinRT

I'm using GetBasicPropertiesAsync() to calculate the available space on the phone (Windows Phone 8.1 RT application).

The method works fine, but sometimes it throws an InvalidOperationException causing the application to crash. I get the following stacktrace:

Exception: System.InvalidOperationException: A method was called at an unexpected time. 
(Exception from HRESULT: 0x8000000E), A method was called at an unexpected time.
(Exception from HRESULT: 0x8000000E), Message: A method was called at an unexpected time.
(Exception from HRESULT: 0x8000000E), Stacktrace:    
at Windows.Storage.StorageFolder.GetBasicPropertiesAsync()

I'm unable to find the cause for this exception. Can anyone give some pointers?