diff --git a/modules/stock_shipment_cost/stock.py b/modules/stock_shipment_cost/stock.py
index bffa53dadf..eba0c8182b 100644
--- a/modules/stock_shipment_cost/stock.py
+++ b/modules/stock_shipment_cost/stock.py
@@ -185,7 +185,7 @@ class ShipmentOutCostMixin(ShipmentCostMixin):
         moves = []
         for shipment in shipments:
             cost = shipment._get_shipment_cost()
-            if not cost:
+            if cost is None:
                 continue
             factors = getattr(shipment,
                 '_get_allocation_shipment_cost_factors_by_%s' %