Removing the second-last item from a SplitPane produces this exception:

java.lang.NullPointerException
at com.sun.javafx.scene.control.skin.SplitPaneSkin.updateDividerPos(SplitPaneSkin.java:281)
at com.sun.javafx.scene.control.skin.SplitPaneSkin.layoutChildren(SplitPaneSkin.java:681)
at javafx.scene.Parent.layout(Parent.java:880)
at javafx.scene.Scene.layoutDirtyRoots(Scene.java:421)
at javafx.scene.Scene.doLayoutPass(Scene.java:394)
at javafx.scene.Scene.access$2800(Scene.java:121)
at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:1687)
at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:279)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:395)
at com.sun.javafx.tk.quantum.QuantumToolkit$10.run(QuantumToolkit.java:328)

Test program (click on the window to provoke the bug):

public class DeleteMe extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        final SplitPane pane = SplitPaneBuilder.create().build();
        Group g1 = new Group();
        final Group g2 = new Group();
        pane.getItems().addAll(g1, g2);
        Scene scene = SceneBuilder.create().height(400).width(400).root(pane).build();
        StageBuilder.create().scene(scene).visible(true).applyTo(stage);
        pane.setOnMouseClicked(new EventHandler<MouseEvent>() {
            @Override public void handle(MouseEvent event) {
                pane.getItems().remove(g2);
            }
        });
    }
}