Fixed null pointer when race finishes #story[1299]

racevisionGame/src/main/java/visualiser/Controllers/NextMarkController.java

@@ -49,9 +49,13 @@ public class NextMarkController {
         AnimationTimer arrow2d = new AnimationTimer() {
             @Override
             public void handle(long now) {
+                if (boat.getCurrentLeg().getEndCompoundMark() != null) {
                     CompoundMark target = boat.getCurrentLeg().getEndCompoundMark();
                     Bearing headingToMark = GPSCoordinate.calculateBearing(boat.getPosition(), target.getAverageGPSCoordinate());
                     arrowStackPane2d.setRotate(headingToMark.degrees());
+                } else {
+                    stop();
+                }
             }
         };
         arrow2d.start();
@@ -73,10 +77,14 @@ public class NextMarkController {
         AnimationTimer arrow3d = new AnimationTimer() {
             @Override
             public void handle(long now) {
+                if (boat.getCurrentLeg().getEndCompoundMark() != null) {
                     arrow.getTransforms().clear();
                     double zRotation = calculateZRotate();
                     arrow.setRotate(calculateXRotate(zRotation));
                     arrow.getTransforms().add(new Rotate(zRotation, new Point3D(0, 0, 1)));
+                } else {
+                    stop();
+                }
             }
         };
         arrow3d.start();