Error trap added

src/engine/gameManager/MaintenanceManager.java

@@ -45,10 +45,13 @@ public enum MaintenanceManager {
         // Deduct upkeep and build list of buildings
         // which did not have funds available
 
-        for (Building building : maintList)
-            if (chargeUpkeep(building) == false)
-                derankList.add(building);
-
+        try {
+            for (Building building : maintList)
+                if (chargeUpkeep(building) == false)
+                    derankList.add(building);
+        } catch (Exception e) {
+            Logger.error(e);
+        }
         // Reset maintenance dates for these buildings
 
         for (Building building : maintList)