After clicking a combo box to open its list and scroll through a large number of items I got this exception:

The exception does not occur consistently. I have only seen it once.

Glass detected outstanding Java exception at -[GlassTouches(hidden) sendJavaTouchEvent:]:src/com/sun/mat/ui/GlassTouches.m:303
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at javafx.scene.Scene$ScenePeerListener.scrollEvent(Scene.java:2316)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleScrollGestureEvent(GlassViewEventHandler.java:516)
at com.sun.glass.ui.View.handleScrollGestureEvent(View.java:585)
at com.sun.glass.ui.View.notifyScrollGestureEvent(View.java:1048)
at com.sun.glass.ui.GestureSupport.handleScrollingEnd(GestureSupport.java:121)
at com.sun.glass.ui.GestureSupport$1.touchCountChanged(GestureSupport.java:343)
at com.sun.glass.ui.TouchInputSupport.notifyEndTouchEvent(TouchInputSupport.java:70)
at com.sun.glass.ui.mac.MacTouchInputSupport.notifyEndTouchEvent(MacTouchInputSupport.java:75)
at com.sun.glass.ui.mac.MacGestureSupport.notifyEndTouchEvent(MacGestureSupport.java:51)
Glass detected outstanding Java exception at -[GlassTouches(hidden) sendJavaTouchEvent:]:src/com/sun/mat/ui/GlassTouches.m:303
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at javafx.scene.Scene$ScenePeerListener.scrollEvent(Scene.java:2316)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleScrollGestureEvent(GlassViewEventHandler.java:516)
at com.sun.glass.ui.View.handleScrollGestureEvent(View.java:585)
at com.sun.glass.ui.View.notifyScrollGestureEvent(View.java:1048)
at com.sun.glass.ui.GestureSupport.handleScrollingEnd(GestureSupport.java:121)
at com.sun.glass.ui.GestureSupport$1.touchCountChanged(GestureSupport.java:343)
at com.sun.glass.ui.TouchInputSupport.notifyEndTouchEvent(TouchInputSupport.java:70)
at com.sun.glass.ui.mac.MacTouchInputSupport.notifyEndTouchEvent(MacTouchInputSupport.java:75)
at com.sun.glass.ui.mac.MacGestureSupport.notifyEndTouchEvent(MacGestureSupport.java:51)