diff --git a/core/modules/hal/lib/Drupal/hal/Normalizer/EntityReferenceItemNormalizer.php b/core/modules/hal/lib/Drupal/hal/Normalizer/EntityReferenceItemNormalizer.php
index e4f8162..64174d9 100644
--- a/core/modules/hal/lib/Drupal/hal/Normalizer/EntityReferenceItemNormalizer.php
+++ b/core/modules/hal/lib/Drupal/hal/Normalizer/EntityReferenceItemNormalizer.php
@@ -52,18 +52,6 @@ public function __construct(LinkManagerInterface $link_manager, EntityResolverIn
   }
 
   /**
-   * {@inheritdoc}
-   */
-  public function supportsNormalization($data, $format = NULL) {
-    // Normalization is only supported if the referenced entity is a content
-    // entity.
-    if (parent::supportsNormalization($data, $format)) {
-      return $data->entity instanceof ContentEntityInterface;
-    }
-    return FALSE;
-  }
-
-  /**
    * Implements \Symfony\Component\Serializer\Normalizer\NormalizerInterface::normalize()
    */
   public function normalize($field_item, $format = NULL, array $context = array()) {
@@ -79,6 +67,10 @@ public function normalize($field_item, $format = NULL, array $context = array())
 
     // Normalize the target entity.
     $embedded = $this->serializer->normalize($target_entity, $format, $context);
+    // @todo Config entities currently can not be serialized, skip them.
+    if (!$embedded) {
+      return array();
+    }
     $link = $embedded['_links']['self'];
     // If the field is translatable, add the langcode to the link relation
     // object. This does not indicate the language of the target entity.