java.lang.NullPointerException
        at ensemble.samples.charts.area.AdvancedAreaChartSample$8$1.handle(AdvancedAreaChartSample.java:184)
        at ensemble.samples.charts.area.AdvancedAreaChartSample$8$1.handle(AdvancedAreaChartSample.java:182)
        at com.sun.scenario.animation.shared.TimelineClipCore.visitKeyFrame(TimelineClipCore.java:196)
        at com.sun.scenario.animation.shared.TimelineClipCore.playTo(TimelineClipCore.java:137)
        at javafx.animation.Timeline.impl_playTo(Timeline.java:182)
        at com.sun.scenario.animation.shared.FiniteClipEnvelope.timePulse(FiniteClipEnvelope.java:100)
        at javafx.animation.Animation.impl_timePulse(Animation.java:934)
        at com.sun.scenario.animation.shared.AnimationPulseReceiver.timePulse(AnimationPulseReceiver.java:72)
        at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:360)
        at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:280)
        at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:390)
        at com.sun.javafx.tk.quantum.QuantumToolkit$10.run(QuantumToolkit.java:328)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
        at com.sun.glass.ui.win.WinApplication$1$1.run(WinApplication.java:49)
        at java.lang.Thread.run(Unknown Source)