Serialization updated. Collection adds slot.

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

@@ -127,11 +127,7 @@ public class ItemProductionMsg extends ClientNetMsg {
                     writer.put((byte) 1);
 
                     Item item;
-
-                    if (this.itemUUID > 0)
-                        item = Item.getFromCache(this.itemUUID);
-                    else
-                        item = ForgeManager.inMemoryItemLookup.get(this.itemUUID);
+                    item = Item.getFromCache(this.itemUUID); // If sent to rolling window adds a new slot.
 
                     if (item == null)
                         Logger.error("Null item serialized");