diff --git a/index.php b/index.php
index c727c4089cec78826565a07533d8e8176639f687..4e25327d3cdc7c5f5b5587b953b4017d770a3cb7 100644
--- a/index.php
+++ b/index.php
@@ -120,8 +120,8 @@ function paralelle(HalRequestIterator $a, HalRequestIterator $b, array $fields,
             ];
             foreach($fields as $field) {
                 $values = [
-                    'a' => isset(get_object_vars($doc_a)[$field])?get_object_vars($doc_a)[$field]:"",
-                    'b' => isset(get_object_vars($doc_b)[$field])?get_object_vars($doc_b)[$field]:""
+                    'a' => isset($doc_a->$field)?$doc_a->$field:"",
+                    'b' => isset($doc_b->$field)?$doc_b->$field:""
                 ];
                 foreach($values as $queryName => $value) {
                     if(is_array($value)) {