diff --git a/src/engine/gameManager/ForgeManager.java b/src/engine/gameManager/ForgeManager.java
index 756cbbae..b546fac0 100644
--- a/src/engine/gameManager/ForgeManager.java
+++ b/src/engine/gameManager/ForgeManager.java
@@ -388,7 +388,7 @@ public enum ForgeManager implements Runnable {
             if (warehouse == null)
                 return false;
 
-            workOrder.production_cost_total.forEach((key, value) -> warehouse.resources.compute(key, (k, v) -> warehouse.resources.get(key) - value));
+            workOrder.production_cost_total.forEach((key, value) -> warehouse.resources.put(key, warehouse.resources.get(key) - value));
             DbManager.WarehouseQueries.UPDATE_WAREHOUSE(warehouse);
         }
         return true;