fail fast on null

src/engine/net/client/msg/ItemProductionMsg.java

@@ -145,8 +145,7 @@ public class ItemProductionMsg extends ClientNetMsg {
                 else
                     item = ForgeManager.inMemoryItemLookup.get(this.itemUUID);
 
-                if (item != null)
+                Item.serializeForClientMsgWithoutSlot(item, writer);
-                    Item.serializeForClientMsgWithoutSlot(item, writer);
 
                 writer.putInt(building.getStrongboxValue());
                 writer.putInt(0);