focus an arbitrary textField, press enter

java.lang.NullPointerException
at com.sun.javafx.scene.control.skin.TextFieldSkin.handleKeyPressedEvent(TextFieldSkin.java:495)
at com.sun.javafx.scene.control.skin.TextInputSkin$7.handle(TextInputSkin.java:110)
at com.sun.javafx.scene.control.skin.TextInputSkin$7.handle(TextInputSkin.java:107)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:56)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:162)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:115)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:47)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Scene$KeyHandler.process(Scene.java:2788)
at javafx.scene.Scene$KeyHandler.access$1500(Scene.java:2718)
at javafx.scene.Scene.impl_processKeyEvent(Scene.java:1328)
at javafx.scene.Scene$ScenePeerListener.keyEvent(Scene.java:1751)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(GlassViewEventHandler.java:95)
at com.sun.glass.ui.View.handleKeyEvent(View.java:248)
at com.sun.glass.ui.View.notifyKey(View.java:534)
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(Thread.java:662)