diff --git a/core/modules/field_ui/lib/Drupal/field_ui/DisplayOverview.php b/core/modules/field_ui/lib/Drupal/field_ui/DisplayOverview.php
index 9f96991..32fd8a6 100644
--- a/core/modules/field_ui/lib/Drupal/field_ui/DisplayOverview.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/DisplayOverview.php
@@ -108,7 +108,7 @@ public function form(array $form, array &$form_state) {
         '#region_callback' => 'field_ui_display_overview_row_region',
         '#js_settings' => array(
           'rowHandler' => 'field',
-          'defaultFormatter' => $field_types[$field['type']]['default_formatter'],
+          'defaultFormatter' => isset($field_types[$field['type']]['default_formatter']) ? $field_types[$field['type']]['default_formatter'] : 'hidden',
         ),
         'human_name' => array(
           '#markup' => check_plain($instance['label']),