--- a/src/Element/BaseSettings.php
+++ b/src/Element/BaseSettings.php
@@ -1272,7 +1272,7 @@ class BaseSettings extends FormElement {
     $id_prefix = implode('-', $parents);
     $element_state = static::getElementState($parents, $form_state);
     $state_color_indexes_key = $id_prefix . '__default_display_color_indexes';
-    $options_display_colors = $options['display']['colors'];
+    $options_display_colors = $options['display']['colors'] ?? [];
     if (!$element_state) {
       $element_state = $options;
       $options_display_colors_indexes = !empty($options_display_colors) ? array_keys($options_display_colors) : [];
@@ -1353,7 +1353,7 @@ class BaseSettings extends FormElement {
       '#operation' => 'add',
       '#element_state_indexes_key' => $state_color_indexes_key,
-      '#array_slicing_args' => ['offset' => 0, 'length' => -4],
+      '#array_slicing_args' => ['offset' => 0, 'length' => -5],
     ];

     $element['display']['color_changer'] = [