diff --git a/addons/sale_stock/models/sale_order.py b/addons/sale_stock/models/sale_order.py
index ec628a5b1b5..aa55b213294 100644
--- a/addons/sale_stock/models/sale_order.py
+++ b/addons/sale_stock/models/sale_order.py
@@ -69,7 +69,7 @@ class SaleOrder(models.Model):
 
     @api.multi
     def action_cancel(self):
-        self.picking_ids.action_cancel()
+        self.mapped('picking_ids').action_cancel()
         return super(SaleOrder, self).action_cancel()
 
     @api.multi