Fix null reference in PlayerHealth

Assets/Scripts/PlayerHealth.cs

@@ -10,7 +10,6 @@ public class PlayerHealth : MonoBehaviour {
     private bool alive = true;
     private Scrollbar healthbar;
     private PlayerControl playerControl;
-    private GameStateTracker gameStateTracker;
     private bool hasShield = false;
 
     public void init(int playerNumber)
@@ -31,7 +30,7 @@ public class PlayerHealth : MonoBehaviour {
         {
             Debug.Log("Player " + name + " dead.");
             alive = false;
-            gameStateTracker.playerDied(name);
+            ((GameStateTracker) Object.FindObjectOfType(typeof(GameStateTracker))).playerDied(name);
             Destroy(gameObject);
         }
     }