diff --git a/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php b/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
index 0eae08b..8f68d0d 100644
--- a/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
+++ b/core/modules/views/src/Plugin/views/display/DisplayPluginBase.php
@@ -1384,7 +1384,7 @@ public function optionsSummary(&$categories, &$options) {
       'desc' => $this->t('Change the CSS class name(s) that will be added to this display.'),
     );
 
-    foreach ($this->extender as $extender) {
+    foreach ($this->extenders as $extender) {
       $extender->optionsSummary($categories, $options);
     }
   }
@@ -1872,7 +1872,7 @@ public function buildOptionsForm(&$form, FormStateInterface $form_state) {
         break;
     }
 
-    foreach ($this->extender as $extender) {
+    foreach ($this->extenders as $extender) {
       $extender->buildOptionsForm($form, $form_state);
     }
   }