diff --git a/src/Plugin/facets/widget/DropdownWidget.php b/src/Plugin/facets/widget/DropdownWidget.php
index fb53ba8..d50e512 100644
--- a/src/Plugin/facets/widget/DropdownWidget.php
+++ b/src/Plugin/facets/widget/DropdownWidget.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\facets\Plugin\facets\widget;
 
+use Drupal\Core\Form\FormStateInterface;
 use Drupal\facets\FacetInterface;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 
@@ -37,6 +38,7 @@ class DropdownWidget extends LinksWidget{
 
     $configuration = $facet->getWidgetConfigs();
     $this->showNumbers = empty($configuration['show_numbers']) ? FALSE : (bool) $configuration['show_numbers'];
+    $this->defaultOptionLabel = isset($configuration['default_option_label']) ? $configuration['default_option_label'] : '';
 
     foreach ($results as $result) {
       if (is_null($result->getUrl())) {
@@ -51,7 +53,7 @@ class DropdownWidget extends LinksWidget{
     $build = [
       '#theme' => 'item_list',
       '#items' => $items,
-      '#attributes' => ['class' => ['js-facets-dropdown-links'], 'data-facet-default-option-label' => $configuration['default_option_label']],
+      '#attributes' => ['class' => ['js-facets-dropdown-links'], 'data-facet-default-option-label' => $this->defaultOptionLabel],
       '#cache' => [
         'contexts' => [
           'url.path',