NPE Bug

import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;

import java.util.Random;
import java.util.concurrent.ConcurrentLinkedQueue;

public class ExceptionTest extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        // Data
        XYChart.Series<Double, Double> series = new XYChart.Series<>();
        ConcurrentLinkedQueue<XYChart.Data<Double, Double>> fullDataQueue = new ConcurrentLinkedQueue<>();
        ObservableList<XYChart.Data<Double, Double>> chartData = FXCollections.observableArrayList();

        series.setData(chartData);

        // Start adding data
        final Random random = new Random();
        for(int n = 0; n < 10000; ++n){
            fullDataQueue.add(new XYChart.Data<>((double)n, random.nextDouble()));
        }

        new AnimationTimer(){
            @Override
            public void handle(long now) {
                for (XYChart.Data<Double, Double> data : fullDataQueue){
                    chartData.add(data);
                }
            }
        }.start();
        System.out.println("Done testSeriesAddInAnimator()!");
    }

    public static void main(String[] args) {
        launch(args);
    }
}