diff --git a/app/models/spree/order.rb b/app/models/spree/order.rb
index 21904aa05d..ab62fb0372 100644
--- a/app/models/spree/order.rb
+++ b/app/models/spree/order.rb
@@ -222,7 +222,7 @@ module Spree
     # There are items present in the order, but either the items have zero price,
     # or the order's total has been modified (maybe discounted) to zero.
     def zero_priced_order?
-      valid? && line_items.count.positive? && total.zero?
+      dup.valid? && line_items.count.positive? && total.zero?
     end
 
     # Returns the relevant zone (if any) to be used for taxation purposes.