diff --git a/core/modules/jsonld/lib/Drupal/jsonld/JsonldEntityWrapper.php b/core/modules/jsonld/lib/Drupal/jsonld/JsonldEntityWrapper.php
index a2e49e3..458a96a 100644
--- a/core/modules/jsonld/lib/Drupal/jsonld/JsonldEntityWrapper.php
+++ b/core/modules/jsonld/lib/Drupal/jsonld/JsonldEntityWrapper.php
@@ -124,7 +124,7 @@ public function getProperties() {
     }
 
     // Only return properties which are not in the $skip array.
-    return array_diff_key($properties, array_fill_keys($skip, ''));
+    return array_diff_key($properties, array_fill_keys($skip, '')) ? array_diff_key($properties, array_fill_keys($skip, '')) : array();
   }
 
 }