diff --git a/core/modules/filter/lib/Drupal/filter/Tests/FilterSettingsTest.php b/core/modules/filter/lib/Drupal/filter/Tests/FilterSettingsTest.php
index 1b6c173..849895e 100644
--- a/core/modules/filter/lib/Drupal/filter/Tests/FilterSettingsTest.php
+++ b/core/modules/filter/lib/Drupal/filter/Tests/FilterSettingsTest.php
@@ -34,6 +34,8 @@ public static function getInfo() {
    */
   function testFilterDefaults() {
     $filter_info = $this->container->get('plugin.manager.filter')->getDefinitions();
+    // @see \Drupal\filter\FilterBag::getAll().
+    unset($filter_info['filter_null']);
     $filters = array_fill_keys(array_keys($filter_info), array());
 
     // Create text format using filter default settings.