Issue #3117052 by super_romeo: Notice: Undefined index: value in getExposedFilterWidgetType()

src/Plugin/better_exposed_filters/filter/FilterWidgetBase.php

@@ -328,7 +328,7 @@ abstract class FilterWidgetBase extends BetterExposedFiltersWidgetBase implement
     /** @var \Drupal\views\Plugin\views\filter\FilterPluginBase $filter */
     $filter->buildExposedForm($form, $form_state);
 
-    return $form[$filter_id]['#type'] ?? $form[$filter_id]['value']['#type'];
+    return $form[$filter_id]['#type'] ?? $form[$filter_id]['value']['#type'] ?? '';
   }
 
 }