diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
index 70c7f547b0..5ccc58cb32 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
@@ -250,7 +250,7 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
 
     $date_format = $this->getSetting('date_format');
     $custom_date_format = '';
-    $timezone = $this->getSetting('timezone');
+    $timezone = $this->getSetting('timezone') ?: NULL;
     $tooltip = $this->getSetting('tooltip');
     $langcode = $tooltip_langcode = NULL;
     $timeago = $this->getSetting('timeago');