There was a null pointer exception when finishing the race, as the finish leg doesn't have compound marks.

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

@@ -429,6 +429,7 @@ public class RaceViewController extends Controller {
             @Override
             public void handle(long now) {
                 CompoundMark target = boat.getCurrentLeg().getEndCompoundMark();
+                if (target != null) {
                     Bearing headingToMark = GPSCoordinate.calculateBearing(boat.getPosition(), target.getAverageGPSCoordinate());
 
                     nextMarkArrow.setX(view3D.getPivot().getX());
@@ -436,6 +437,7 @@ public class RaceViewController extends Controller {
                     nextMarkArrow.setZ(view3D.getPivot().getZ() + 15);
                     nextMarkArrow.setHeading(headingToMark.degrees());
                 }
+            }
         };
         arrowToNextMark.start();
     }