diff --git a/core/lib/Drupal/Core/Entity/ContentEntityForm.php b/core/lib/Drupal/Core/Entity/ContentEntityForm.php
index 17b90c7..671b5ad 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityForm.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityForm.php
@@ -147,7 +147,9 @@ protected function updateFormLangcode(FormStateInterface $form_state) {
     //   https://www.drupal.org/node/2143729.
     if ($form_state->hasValue('langcode') && $this->isDefaultFormLangcode($form_state)) {
       $langcode = $form_state->getValue('langcode');
-      $langcode = isset($langcode[0]['value']) ? $langcode[0]['value'] : NULL;
+      if(is_array($langcode)) {
+        $langcode = isset($langcode[0]['value']) ? $langcode[0]['value'] : NULL;
+      }
       $form_state->set('langcode', $langcode);
     }
   }