diff --git a/core/modules/language/src/EventSubscriber/ConfigSubscriber.php b/core/modules/language/src/EventSubscriber/ConfigSubscriber.php
index 738a1b0..a56ac01 100644
--- a/core/modules/language/src/EventSubscriber/ConfigSubscriber.php
+++ b/core/modules/language/src/EventSubscriber/ConfigSubscriber.php
@@ -84,16 +84,7 @@ public function __construct(LanguageManagerInterface $language_manager, Language
   public function onConfigSave(ConfigCrudEvent $event) {
     $saved_config = $event->getConfig();
     if ($saved_config->getName() == 'system.site' && $event->isChanged('default_langcode')) {
-      // Ensure that the configuration that will be changed or relied upon has
-      // the expected data type of 'string'.
-      $default_langcode_definition = $this->typedConfig->get('system.site')->get('default_langcode')->getDataDefinition();
-      $old_default_langcode = $saved_config->getOriginal('default_langcode');
-      $url_prefix_definition = $this->typedConfig->get('language.negotiation')->get('url.prefixes.' . $old_default_langcode)->getDataDefinition();
-      if ($default_langcode_definition->getDataType() !== 'string' || $url_prefix_definition->getDataType() != 'string') {
-        return;
-      }
       $new_default_langcode = $saved_config->get('default_langcode');
-
       $default_language = $this->configFactory->get('language.entity.' . $new_default_langcode);
       // During an import the language might not exist yet.
       if (!$default_language->isNew()) {
@@ -105,6 +96,7 @@ public function onConfigSave(ConfigCrudEvent $event) {
         $negotiation_config = $this->configFactory->getEditable('language.negotiation');
         $negotiation_changed = FALSE;
         $url_prefixes = $negotiation_config->get('url.prefixes');
+        $old_default_langcode = $saved_config->getOriginal('default_langcode');
         if (empty($url_prefixes[$old_default_langcode])) {
           $negotiation_config->set('url.prefixes.' . $old_default_langcode, $old_default_langcode);
           $negotiation_changed = TRUE;