Error logging added

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

@@ -17,6 +17,7 @@ import engine.net.*;
 import engine.objects.Building;
 import engine.objects.Item;
 import engine.objects.NPC;
+import org.pmw.tinylog.Logger;
 
 import java.util.HashMap;
 
@@ -126,12 +127,17 @@ 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);
 
+                    if (item == null)
+                        Logger.error("Null item serialized");
+                    else
                         Item.serializeForClientMsgWithoutSlot(item, writer);
+
                     writer.putInt(building.getStrongboxValue());
                     writer.putInt(0);
                     writer.putInt(0);
@@ -149,6 +155,9 @@ public class ItemProductionMsg extends ClientNetMsg {
                 else
                     item = ForgeManager.inMemoryItemLookup.get(this.itemUUID);
 
+                if (item == null)
+                    Logger.error("Null item serialized");
+                else
                     Item.serializeForClientMsgWithoutSlot(item, writer);
 
                 writer.putInt(building.getStrongboxValue());