diff --git a/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php b/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
index b464a46..9951ea7 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
@@ -51,5 +51,12 @@ function testSimpleAjaxFormValue() {
       $expected = new DataCommand('#ajax_checkbox_value', 'form_state_value_select', (int) $item);
       $this->assertCommand($commands, $expected->render(), 'Verification of AJAX form values from a checkbox issued with a correct value.');
     }
+
+    // Verify that an AJAX element without a callback throws error code 500.
+    $edit = array(
+      'select_dummy' => 'red',
+    );
+    $commands = $this->drupalPostAJAX('ajax_forms_test_get_form', $edit, 'select_dummy');
+    $this->assertResponse(500);
   }
 }
diff --git a/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module b/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module
index 1682c01..65273ad 100644
--- a/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module
+++ b/core/modules/system/tests/modules/ajax_forms_test/ajax_forms_test.module
@@ -72,6 +72,14 @@ function ajax_forms_test_simple_form($form, &$form_state) {
     '#type' => 'submit',
     '#value' => t('submit'),
   );
+
+  $form['select_dummy'] = array(
+    '#type' => 'select',
+    '#options' => array('red' => 'red'),
+    '#ajax' => array('callback' => ''),
+    '#suffix' => '<div id="ajax_dummy_selected_color">No color yet selected</div>',
+  );
+
   return $form;
 }