diff -u b/js/checkbox-widget.js b/js/checkbox-widget.js
--- b/js/checkbox-widget.js
+++ b/js/checkbox-widget.js
@@ -45,7 +45,7 @@
         // register handlers on that element.
         $widget.addClass('js-facets-widget');
 
-        facetSettings = drupalSettings.facets[$widget.data('drupal-facet-id')];
+        facetSettings = (drupalSettings.facets && drupalSettings.facets[$widget.data('drupal-facet-id')]) ?? {};
         // Transform links to checkboxes.
         $widgetLinks.each(Drupal.facets.makeCheckbox);
 
@@ -122,7 +122,7 @@
     var href = $link.attr('href');
     var id = $link.data('drupal-facet-item-id');
     var $widget = $(this).closest('.js-facets-widget');
-    var facetSettings = drupalSettings.facets[$widget.data('drupal-facet-id')];
+    var facetSettings = (drupalSettings.facets && drupalSettings.facets[$widget.data('drupal-facet-id')]) ?? {};
 
     var checkbox = $('<input type="checkbox" class="facets-checkbox">')
       .attr('id', id)
@@ -132,7 +132,8 @@
 
     // Do not trigger facets on change when auto-submit is disabled, so we can trigger them manually clicking on the
     // apply button.
-    if (!facetSettings.disable_autosubmit) {
+    var disableAutosubmit = facetSettings.disable_autosubmit ?? false;
+    if (!disableAutosubmit) {
       checkbox.on('change.facets', function (e) {
         e.preventDefault();
 
diff -u b/src/Plugin/facets/widget/CheckboxWidget.php b/src/Plugin/facets/widget/CheckboxWidget.php
--- b/src/Plugin/facets/widget/CheckboxWidget.php
+++ b/src/Plugin/facets/widget/CheckboxWidget.php
@@ -23,11 +23,15 @@
     $build['#attributes']['class'][] = 'js-facets-checkbox-links';
     $build['#attached']['library'][] = 'facets/drupal.facets.checkbox-widget';
     if ($this->isDisablingAllowed()) {
-      $build['#attached']['drupalSettings']['facets'][$this->facet->id()]['disable_autosubmit'] = $this->getConfiguration()['disable_autosubmit'];
-      $build['#attached']['drupalSettings']['facets'][$this->facet->id()]['submit_button_label'] = $this->getConfiguration()['submit_button_label'];
+      $facetConfiguration = [
+        'disable_autosubmit' => $this->getConfiguration()['disable_autosubmit'],
+        'submit_button_label' => $this->getConfiguration()['submit_button_label'],
+      ];
       if ($facet_source = $this->facet->getFacetSource()) {
-        $build['#attached']['drupalSettings']['facets'][$this->facet->id()]['facet_source_path'] = $facet_source->getPath();
+        $facetConfiguration['facet_source_path'] = $facet_source->getPath();
       }
+
+      $build['#attached']['drupalSettings']['facets'][$this->facet->id()] = $facetConfiguration;
     }
   }
 
@@ -89,9 +93,12 @@
     if (empty($pages)) {
       return TRUE;
     }
-    $pages = explode(PHP_EOL, $pages);
-    $current_path = \Drupal::request()->getRequestUri();
-    return in_array($current_path, $pages);
+    /* @var \Drupal\system\Plugin\Condition\RequestPath $condition */
+    $pathCondition = \Drupal::service('plugin.manager.condition')
+      ->createInstance('request_path')
+      ->setConfiguration(['pages' => $pages]);
+
+    return $pathCondition->evaluate();
   }
 
 }