diff --git a/src/engine/mbEnums.java b/src/engine/mbEnums.java
index fa8d81e5..83b9e8c4 100644
--- a/src/engine/mbEnums.java
+++ b/src/engine/mbEnums.java
@@ -2741,6 +2741,7 @@ public class mbEnums {
 
         public static HashMap<Integer, ResourceType> templateLookup = new HashMap<>();
         public static HashMap<Integer, ResourceType> templateHashLookup = new HashMap<>();
+        public static HashMap<Integer, ResourceType> resourceHashLookup = new HashMap<>();
         public int templateID;
         public ItemTemplate template;
         public int resourceHash;
@@ -2762,6 +2763,7 @@ public class mbEnums {
             for (ResourceType resourceType : ResourceType.values()) {
                 templateLookup.put(resourceType.templateID, resourceType);
                 templateHashLookup.put(resourceType.templateHash, resourceType);
+                resourceHashLookup.put(resourceType.resourceHash, resourceType);
             }
 
         }
diff --git a/src/engine/net/client/handlers/ArcMineChangeProductionMsgHandler.java b/src/engine/net/client/handlers/ArcMineChangeProductionMsgHandler.java
index 4488c083..f4fcfe96 100644
--- a/src/engine/net/client/handlers/ArcMineChangeProductionMsgHandler.java
+++ b/src/engine/net/client/handlers/ArcMineChangeProductionMsgHandler.java
@@ -50,7 +50,7 @@ public class ArcMineChangeProductionMsgHandler extends AbstractClientMsgHandler
 
         //make sure valid resource
 
-        mbEnums.ResourceType resource = mbEnums.ResourceType.templateHashLookup.get(changeProductionMsg.getResourceHash());
+        mbEnums.ResourceType resource = mbEnums.ResourceType.resourceHashLookup.get(changeProductionMsg.getResourceHash());
 
         if (resource == null)
             return true;