diff --git modules/callbacks.inc modules/callbacks.inc
index 037480b..bc3b576 100644
--- modules/callbacks.inc
+++ modules/callbacks.inc
@@ -707,5 +707,5 @@ function entity_metadata_field_query($entity_type, $property, $value, $limit) {
         ->range(0, $limit);
 
   $result = $query->execute();
-  return array_keys($result[$entity_type]);
+  return !empty($result[$entity_type]) ? array_keys($result[$entity_type]) : array();
 }