NullReferenceException is thrown when analog card is used and is not preloaded.

[(25)]: Exception :System.NullReferenceException: Object reference not set to an instance of an object.
  at TvLibrary.Implementations.Analog.TvCardAnalog.UpdateSignalQuality(Boolean force)
  at TvLibrary.Implementations.TvCardBase.get_IsTunerLocked()
  at TvLibrary.Implementations.Hybrid.HybridCard.get_IsTunerLocked()
  at TvService.TvCardHandler.get_TunerLocked()

Problem is in TvCardAnalog.UpdateSignalQuality(bool force) method. This method try to access to tuner, but tuner is not created (null).