diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/LanguageFormatter.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/LanguageFormatter.php
index 20b23a2..8ccc047 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/LanguageFormatter.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/LanguageFormatter.php
@@ -61,6 +61,7 @@ public function settingsSummary() {
         $summary['#markup'] = $additional_summary;
       }
     }
+    return $summary;
   }
 
   /**
diff --git a/core/modules/views/tests/src/Unit/EntityViewsDataTest.php b/core/modules/views/tests/src/Unit/EntityViewsDataTest.php
index c1aac0f..bee18f2 100644
--- a/core/modules/views/tests/src/Unit/EntityViewsDataTest.php
+++ b/core/modules/views/tests/src/Unit/EntityViewsDataTest.php
@@ -705,7 +705,7 @@ protected function assertNumericField($data) {
    *   The views data to check.
    */
   protected function assertLanguageField($data) {
-    $this->assertEquals('language', $data['field']['id']);
+    $this->assertEquals('field', $data['field']['id']);
     $this->assertEquals('language', $data['filter']['id']);
     $this->assertEquals('language', $data['argument']['id']);
     $this->assertEquals('standard', $data['sort']['id']);