diff --git a/src/Service/Serializer/Denormalizer/Search/DataObjectSearchResultDenormalizer.php b/src/Service/Serializer/Denormalizer/Search/DataObjectSearchResultDenormalizer.php
index 5c31f5cf..ddcef3fc 100644
--- a/src/Service/Serializer/Denormalizer/Search/DataObjectSearchResultDenormalizer.php
+++ b/src/Service/Serializer/Denormalizer/Search/DataObjectSearchResultDenormalizer.php
@@ -63,8 +63,8 @@ public function denormalize(
             ->setPublished($published)
             ->setKey(SystemField::KEY->getData($data))
             ->setIndex(SystemField::INDEX->getData($data))
-            ->setChildrenSortBy(SystemField::CHILDREN_SORT_BY->getData($data))
-            ->setChildrenSortOrder(SystemField::CHILDREN_SORT_ORDER->getData($data))
+            ->setChildrenSortBy(SystemField::CHILDREN_SORT_BY->getData($data) ?? '')
+            ->setChildrenSortOrder(SystemField::CHILDREN_SORT_ORDER->getData($data) ?? '')
             ->setPath(SystemField::PATH->getData($data))
             ->setFullPath(SystemField::FULL_PATH->getData($data))
             ->setUserOwner(SystemField::USER_OWNER->getData($data) ?? 0)