Make sure tooltip is showing then close window by clicking X. Works in Mac but not in Windows.

java -ea -cp D:\workspace\FX\8.0\build\jfx\artifacts\sdk/rt/lib/ext/jfxrt.jar;di
st/HelloWorld.jar helloworld.HelloTooltip
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
        at com.sun.javafx.tk.quantum.WindowStage.requestToFront(WindowStage.java
:669)
        at com.sun.javafx.tk.quantum.WindowStage.setVisible(WindowStage.java:381
)
        at javafx.stage.Window$9.invalidated(Window.java:789)
        at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanProperty
Base.java:107)
        at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.jav
a:141)
        at javafx.stage.Window.setShowing(Window.java:827)
        at javafx.stage.Window.hide(Window.java:852)
        at javafx.stage.PopupWindow.hide(PopupWindow.java:416)
        at javafx.stage.PopupWindow$2.changed(PopupWindow.java:118)
        at javafx.stage.PopupWindow$2.changed(PopupWindow.java:113)
        at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChanged
Event(ExpressionHelper.java:176)
        at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(Express
ionHelper.java:80)
        at javafx.beans.property.ReadOnlyBooleanWrapper$ReadOnlyPropertyImpl.fir
eValueChangedEvent(ReadOnlyBooleanWrapper.java:177)
        at javafx.beans.property.ReadOnlyBooleanWrapper$ReadOnlyPropertyImpl.acc
ess$100(ReadOnlyBooleanWrapper.java:147)
        at javafx.beans.property.ReadOnlyBooleanWrapper.fireValueChangedEvent(Re
adOnlyBooleanWrapper.java:143)
        at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanProperty
Base.java:108)
        at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.jav
a:141)
        at javafx.stage.Window.setShowing(Window.java:827)
        at javafx.stage.Window.hide(Window.java:852)