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CaptionsPlugin throws NullReferenceException
Universal.Xaml.TimedText/CaptionsPlugin.timer_Tick(...) throws NullReferenceException because of a null MediaPlayer. It happens sometimes, after MediaPlayer.Dispose() probably because CaptionPlugin was removed from MediaPlayer.Plugins but not yet collected
and the timer event has time to fire.
Proposed solution: OnDeactivate() calls ShutdownTimer().