core_check_service_language.diff

core_check_service_language.diff

diff --git a/core/modules/language/language.module b/core/modules/language/language.module
index 91641dec..cac5f59a 100644
--- a/core/modules/language/language.module
+++ b/core/modules/language/language.module
@@ -294,11 +294,13 @@ function language_modules_installed($modules) {
     // Since newly (un)installed modules may change the default settings for
     // non-locked language types (e.g. content language), we need to resave the
     // language type configuration.
-    /** @var \Drupal\language\LanguageNegotiatorInterface $negotiator */
-    $negotiator = \Drupal::service('language_negotiator');
-    $configurable = \Drupal::config('language.types')->get('configurable');
-    $negotiator->updateConfiguration($configurable);
-    $negotiator->purgeConfiguration();
+    if (!empty(\Drupal::hasService('language_negotiator'))) {
+      /** @var \Drupal\language\LanguageNegotiatorInterface $negotiator */
+      $negotiator = \Drupal::service('language_negotiator');
+      $configurable = \Drupal::config('language.types')->get('configurable');
+      $negotiator->updateConfiguration($configurable);
+      $negotiator->purgeConfiguration();
+    }
   }
   else {
     // In language_entity_base_field_info_alter() we are altering view/form