diff --git a/Distribution/Features/DeliveryRide/DeliveryTaskService.cs b/Distribution/Features/DeliveryRide/DeliveryTaskService.cs
index 265ef1f..45f4493 100644
--- a/Distribution/Features/DeliveryRide/DeliveryTaskService.cs
+++ b/Distribution/Features/DeliveryRide/DeliveryTaskService.cs
@@ -187,9 +187,9 @@ public class DeliveryTaskService(
             repo.Update(task);
             orderRepo.Update(order);
 
-            if (fullyDelivered)
+            if (fullyDelivered && order.FK_SaleId is Guid saleId)
             {
-                var sale = await saleRepo.GetByIdAsync(order.FK_SaleId)
+                var sale = await saleRepo.GetByIdAsync(saleId)
                     ?? throw new KeyNotFoundException("Sale not found");
                 sale.Status = SaleStatus.Completed;
                 sale.CompletedAt = DateTime.Now;