multiplier display

src/engine/gameManager/SimulationManager.java

@@ -238,7 +238,8 @@ public enum SimulationManager {
 
         for (AbstractGameObject mineObject : mineList) {
             mine = (Mine) mineObject;
-            mine.onEnter();
+            if(mine.isActive)
+                mine.onEnter();
         }
 
         _minePulseTime = System.currentTimeMillis() + CITY_PULSE;