diff --git a/core/modules/block/lib/Drupal/block/BlockRenderController.php b/core/modules/block/lib/Drupal/block/BlockRenderController.php
index 79f939a..45a85d9 100644
--- a/core/modules/block/lib/Drupal/block/BlockRenderController.php
+++ b/core/modules/block/lib/Drupal/block/BlockRenderController.php
@@ -49,6 +49,9 @@ public function viewMultiple(array $entities = array(), $view_mode = 'full', $la
         );
         $build[$entity_id]['#configuration']['label'] = check_plain($configuration['label']);
       }
+      else {
+        $build[$entity_id] = array();
+      }
 
       list($base_id) = explode(':', $plugin_id);
       drupal_alter(array('block_view', "block_view_$base_id"), $build[$entity_id], $plugin);