diff --git a/core/modules/config_translation/src/Controller/ConfigTranslationController.php b/core/modules/config_translation/src/Controller/ConfigTranslationController.php
index 98ab72b..36829d2 100644
--- a/core/modules/config_translation/src/Controller/ConfigTranslationController.php
+++ b/core/modules/config_translation/src/Controller/ConfigTranslationController.php
@@ -8,6 +8,7 @@
 namespace Drupal\config_translation\Controller;
 
 use Drupal\config_translation\ConfigMapperManagerInterface;
+use Drupal\config_translation\ConfigNamesMapper;
 use Drupal\Core\Access\AccessManagerInterface;
 use Drupal\Core\Controller\ControllerBase;
 use Drupal\Core\Language\Language;
@@ -132,7 +133,31 @@ public function itemPage(Request $request, RouteMatchInterface $route_match, $pl
     if (count($languages) == 1) {
       drupal_set_message($this->t('In order to translate configuration, the website must have at least two <a href=":url">languages</a>.', array(':url' => $this->url('entity.configurable_language.collection'))), 'warning');
     }
-    $original_langcode = $mapper->getLangcode();
+
+    try {
+      $original_langcode = $mapper->getLangcode();
+    }
+    catch (\RuntimeException $exception) {
+      $message = '';
+      if ($mapper instanceof ConfigNamesMapper) {
+        $items = [];
+        foreach ($mapper->getconfigNames() as $config_name) {
+          $langcode = $mapper->getLangcodeFromConfig($config_name);
+          $items[] = $config_name .': ' . $this->languageManager->getLanguage($langcode)->getName();
+        }
+        $message = [
+          'message' => ['#markup' => t('Configuration objects have different language codes:')],
+          'items' => [
+            '#theme' => 'item_list',
+            '#items' => $items,
+          ]
+        ];
+      }
+      $page['message'] = $message;
+      return $page;
+    }
+
+
     if (!isset($languages[$original_langcode])) {
       // If the language is not configured on the site, create a dummy language
       // object for this listing only to ensure the user gets useful info.
diff --git a/core/modules/node/src/Tests/NodeTypeTranslationTest.php b/core/modules/node/src/Tests/NodeTypeTranslationTest.php
index a473233..627dffd 100644
--- a/core/modules/node/src/Tests/NodeTypeTranslationTest.php
+++ b/core/modules/node/src/Tests/NodeTypeTranslationTest.php
@@ -165,6 +165,7 @@ public function testNodeTypeTitleLabelTranslation() {
     $this->assertResponse(200);
     $this->drupalGet("es/admin/structure/types/manage/$type/fields/node.$type.field_email/translate");
     $this->assertResponse(200);
+    $this->assertText("Configuration objects have different language codes");
   }
 
 }