diff -u b/core/modules/language/lib/Drupal/language/Config/LanguageConfigFactoryOverride.php b/core/modules/language/lib/Drupal/language/Config/LanguageConfigFactoryOverride.php
--- b/core/modules/language/lib/Drupal/language/Config/LanguageConfigFactoryOverride.php
+++ b/core/modules/language/lib/Drupal/language/Config/LanguageConfigFactoryOverride.php
@@ -204,7 +204,7 @@
     foreach (\Drupal::languageManager()->getLanguages() as $language) {
       $collections[] = $this->createConfigCollectionName($language->getId());
     }
-    $event->addCollections($collections, $this);
+    $event->addCollections($collections);
   }
 
   /**