diff --git a/src/Form/FacetDisplayForm.php b/src/Form/FacetDisplayForm.php
index 83b8e17..bc843df 100644
--- a/src/Form/FacetDisplayForm.php
+++ b/src/Form/FacetDisplayForm.php
@@ -325,6 +325,7 @@ public function form(array $form, FormStateInterface $form_state) {
               'facets-processor-settings',
             ),
           ),
+          '#parents' => ['facet_sorting', $processor_id],
           '#states' => array(
             'visible' => array(
               ':input[name="facet_sorting[' . $processor_id . '][status]"]' => array('checked' => TRUE),
@@ -334,8 +335,12 @@ public function form(array $form, FormStateInterface $form_state) {
         $form['facet_sorting'][$processor_id]['settings'] += $processor_form;

         // Make sure that settings are saved as expected.
-        foreach ($sorting_settings[$processor_id]['settings'] as $k => $value) {
-          $form['facet_sorting'][$processor_id]['settings'][$k]['#default_value'] = $value;
+        if (isset($sorting_settings[$processor_id])) {
+          foreach ($sorting_settings[$processor_id] as $k => $value) {
+            if (isset($form['facet_sorting'][$processor_id]['settings'][$k])) {
+              $form['facet_sorting'][$processor_id]['settings'][$k]['#default_value'] = $value;
+            }
+          }
         }
       }
     }