new maintenance completed

src/engine/gameManager/MaintenanceManager.java

@@ -54,7 +54,7 @@ public enum MaintenanceManager {
         for (AbstractGameObject ago : worldCities.values()) {
             if (ago.getObjectType().equals(Enum.GameObjectType.City)) {
                 City city = (City) ago;
-                if(city == null)
+                if(city == null || city.getIsNpcOwned() == 1)
                     continue;
 
                 Building tol = city.getTOL();