diff --git a/core/modules/rest/src/Plugin/rest/resource/EntityResource.php b/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
index 40f7fe6..6b190b8 100644
--- a/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
+++ b/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\rest\Plugin\rest\resource;
 
+use Drupal\Core\Entity\ContentEntityInterface;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityStorageException;
 use Drupal\rest\Plugin\ResourceBase;
@@ -46,9 +47,11 @@ public function get(EntityInterface $entity) {
     if (!$entity->access('view')) {
       throw new AccessDeniedHttpException();
     }
-    foreach ($entity as $field_name => $field) {
-      if (!$field->access('view')) {
-        unset($entity->{$field_name});
+    if (is_a($entity, ContentEntityInterface)) {
+      foreach ($entity as $field_name => $field) {
+        if (!$field->access('view')) {
+          unset($entity->{$field_name});
+        }
       }
     }
     return new ResourceResponse($entity);