diff --git a/core/modules/language/language.module b/core/modules/language/language.module
index 311a249..ddb8016 100644
--- a/core/modules/language/language.module
+++ b/core/modules/language/language.module
@@ -96,7 +96,7 @@ function language_help($route_name, RouteMatchInterface $route_match) {
  *   Use \Drupal\language\LanguageAccessController.
  */
 function language_access_language_edit_or_delete($language) {
-  return !$language->isLocked() && \Drupal::currentUser()->hasPermission('administer languages');
+  return !$language->locked && \Drupal::currentUser()->hasPermission('administer languages');
 }
 
 /**
@@ -462,7 +462,7 @@ function language_save(LanguageInterface $language) {
  */
 function language_delete($langcode) {
   $languages = \Drupal::languageManager()->getLanguages(LanguageInterface::STATE_ALL);
-  if(isset($languages[$langcode]) && !$languages[$langcode]->isLocked()) {
+  if (isset($languages[$langcode]) && !$languages[$langcode]->isLocked()) {
     $language = $languages[$langcode];
 
     // Remove the language.
@@ -599,7 +599,7 @@ function language_language_entity_insert(LanguageEntity $language) {
 
   // Add language to the list of language domains.
   $domains = language_negotiation_url_domains();
-  $domains[$language->id] = '';
+  $domains[$language->id()] = '';
   language_negotiation_url_domains_save($domains);
 }
 
@@ -609,12 +609,12 @@ function language_language_entity_insert(LanguageEntity $language) {
 function language_language_entity_delete(LanguageEntity $language) {
   // Remove language from language prefix list.
   $prefixes = language_negotiation_url_prefixes();
-  unset($prefixes[$language->id]);
+  unset($prefixes[$language->id()]);
   language_negotiation_url_prefixes_save($prefixes);
 
   // Remove language from language domain list.
   $domains = language_negotiation_url_domains();
-  unset($domains[$language->id]);
+  unset($domains[$language->id()]);
   language_negotiation_url_domains_save($domains);
 }