When AdvancedMediaPlayer is laid out after fullscreen mode, sometimes an exception is thrown:

java.lang.NullPointerException
        at ensemble.samples.media.advancedmedia.MediaControl$8$2.layoutChildren(MediaControl.java:286)
        at javafx.scene.Parent.layout(Parent.java:1032)
        at javafx.scene.Scene.layoutDirtyRoots(Scene.java:615)
        at javafx.scene.Scene.doLayoutPass(Scene.java:586)
        at javafx.scene.Scene.access$3700(Scene.java:190)
        at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2374)
        at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:360)
        at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:589)
        at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:569)
        at com.sun.javafx.tk.quantum.QuantumToolkit$16.run(QuantumToolkit.java:436)
        at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
        at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:101)
        at java.lang.Thread.run(Thread.java:724)

Affected tests:
tests/samples/Ensemble8_28_Media