diff --git a/core/modules/ckeditor/ckeditor.admin.inc b/core/modules/ckeditor/ckeditor.admin.inc
index 4ffcbd8..50bff04 100644
--- a/core/modules/ckeditor/ckeditor.admin.inc
+++ b/core/modules/ckeditor/ckeditor.admin.inc
@@ -48,6 +48,7 @@ function template_preprocess_ckeditor_settings_toolbar(&$variables) {
     foreach ($row as $group) {
       foreach ($group['items'] as $button_name) {
         if (isset($buttons[$button_name])) {
+          //$group_name = (string) $group['name'];
           // Save a reference to the button's configured toolbar group.
           $buttons[$button_name]['group'] = $group['name'];
           $active_buttons[$row_number][] = $buttons[$button_name];
@@ -123,7 +124,7 @@ function template_preprocess_ckeditor_settings_toolbar(&$variables) {
         'buttons' => array(),
       );
       $buttons = array_filter($button_row, function ($button) use ($group_name) {
-        return $button['group'] === $group_name;
+        return (string) $button['group'] === $group_name;
       });
       foreach ($buttons as $button) {
         $variables['active_buttons'][$row_number][$group_name]['buttons'][] = $build_button_item($button, $rtl);