diff --git a/src/Sylius/Bundle/AdminApiBundle/Form/ChoiceList/LazyCustomerLoader.php b/src/Sylius/Bundle/AdminApiBundle/Form/ChoiceList/LazyCustomerLoader.php
index b2f6cff11417..e1cb6f42ba3a 100644
--- a/src/Sylius/Bundle/AdminApiBundle/Form/ChoiceList/LazyCustomerLoader.php
+++ b/src/Sylius/Bundle/AdminApiBundle/Form/ChoiceList/LazyCustomerLoader.php
@@ -61,7 +61,13 @@ public function loadChoicesForValues(array $values, $value = null)
     public function loadValuesForChoices(array $choices, $value = null)
     {
         $mapCustomerToEmail = function($customer){
+            if($customer == null){
+                return null;
+            }
 
+            return $customer->getEmail();
         };
+
+        return array_map($mapCustomerToEmail, $choices);
     }
 }
\ No newline at end of file