diff --git a/core/modules/views_ui/src/ViewEditForm.php b/core/modules/views_ui/src/ViewEditForm.php
index 5a4b23c..67450a4 100644
--- a/core/modules/views_ui/src/ViewEditForm.php
+++ b/core/modules/views_ui/src/ViewEditForm.php
@@ -738,6 +738,7 @@ public function renderDisplayTop(ViewUI $view) {
 
     // Buttons for adding a new display.
     foreach (Views::fetchPluginNames('display', NULL, array($view->get('base_table'))) as $type => $label) {
+      $label = (string) $label;
       $element['add_display'][$type] = array(
         '#type' => 'submit',
         '#value' => $this->t('Add !display', array('!display' => $label)),