ArgumentError: Cannot transition if both old screen and new screen are null.
	at Function/WindowsStackNavigator.as$1:anonymous()[D:\work\MagicStory\modules\game\src\view\windows\WindowsStackNavigator.as:45]
	at feathers.controls.supportClasses::BaseScreenNavigator/waitingForTransition_enterFrameHandler()
	at starling.events::EventDispatcher/invokeEvent()[/Users/redge/Dropbox/Development/starling/starling/src/starling/events/EventDispatcher.as:147]
	at starling.events::EventDispatcher/dispatchEvent()[/Users/redge/Dropbox/Development/starling/starling/src/starling/events/EventDispatcher.as:118]
	at starling.display::DisplayObject/dispatchEvent()[D:\work\sdk\StarlingGit\starling\src\starling\display\DisplayObject.as:614]
	at starling.display::DisplayObjectContainer/broadcastEvent()[D:\work\sdk\StarlingGit\starling\src\starling\display\DisplayObjectContainer.as:418]
	at starling.display::Stage/advanceTime()[D:\work\sdk\StarlingGit\starling\src\starling\display\Stage.as:95]
	at starling.core::Starling/advanceTime()[D:\work\sdk\StarlingGit\starling\src\starling\core\Starling.as:401]
	at starling.core::Starling/nextFrame()[D:\work\sdk\StarlingGit\starling\src\starling\core\Starling.as:387]
	at starling.core::Starling/onEnterFrame()[D:\work\sdk\StarlingGit\starling\src\starling\core\Starling.as:601]