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

@@ -429,12 +429,14 @@ public class RaceViewController extends Controller {
             @Override
             public void handle(long now) {
                 CompoundMark target = boat.getCurrentLeg().getEndCompoundMark();
-                Bearing headingToMark = GPSCoordinate.calculateBearing(boat.getPosition(), target.getAverageGPSCoordinate());
+                if (target != null) {
+                    Bearing headingToMark = GPSCoordinate.calculateBearing(boat.getPosition(), target.getAverageGPSCoordinate());
 
-                nextMarkArrow.setX(view3D.getPivot().getX());
-                nextMarkArrow.setY(view3D.getPivot().getY());
-                nextMarkArrow.setZ(view3D.getPivot().getZ() + 15);
-                nextMarkArrow.setHeading(headingToMark.degrees());
+                    nextMarkArrow.setX(view3D.getPivot().getX());
+                    nextMarkArrow.setY(view3D.getPivot().getY());
+                    nextMarkArrow.setZ(view3D.getPivot().getZ() + 15);
+                    nextMarkArrow.setHeading(headingToMark.degrees());
+                }
             }
         };
         arrowToNextMark.start();