Concurrency update

src/engine/gameManager/NPCManager.java

@@ -27,7 +27,7 @@ import org.pmw.tinylog.Logger;
 
 import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.List;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ThreadLocalRandom;
 
 import static engine.math.FastMath.acos;
@@ -523,7 +523,7 @@ public enum NPCManager {
 
         ArrayList<Item> itemList = new ArrayList<>();
 
-        List<WorkOrder> vendorWorkOrders = ForgeManager.vendorWorkOrderLookup.get(npc);
+        ConcurrentHashMap.KeySetView<WorkOrder, Boolean> vendorWorkOrders = ForgeManager.vendorWorkOrderLookup.get(npc);
 
         for (WorkOrder workOrder : vendorWorkOrders)
             itemList.addAll(workOrder.cooking);