Issue #3513050 by mably: TypeError: Drupal\Component\Utility\Html::escape():...

modules/views_filters_summary_search_api/views_filters_summary_search_api.module

@@ -26,10 +26,13 @@ function views_filters_summary_search_api_views_filters_summary_plugin_alias($fi
  * Implements hook_views_filters_summary_replacements_alter().
  */
 function views_filters_summary_search_api_views_filters_summary_replacements_alter(&$replacements, $view) {
-  foreach ($view->display_handler->handlers["filter"] as $filter) {
-    if ($filter->getPluginId() == 'search_api_fulltext') {
-      $identifier = $filter->options["expose"]["identifier"];
-      $replacements['search_api_fulltext'] = Html::escape($view->exposed_data[$identifier]);
+  foreach ($view->display_handler->handlers['filter'] as $filter) {
+    if ($filter->getPluginId() === 'search_api_fulltext') {
+      $identifier = $filter->options['expose']['identifier'];
+      $exposed_data = $view->exposed_data[$identifier] ?? NULL;
+      if (!empty($exposed_data)) {
+        $replacements['search_api_fulltext'] = Html::escape($exposed_data);
+      }
     }
   }
 }