diff --git a/core/lib/Drupal/Core/Form/FormBuilder.php b/core/lib/Drupal/Core/Form/FormBuilder.php
index 7008231..568f99c 100644
--- a/core/lib/Drupal/Core/Form/FormBuilder.php
+++ b/core/lib/Drupal/Core/Form/FormBuilder.php
@@ -675,8 +675,10 @@ public function prepareForm($form_id, &$form, &$form_state) {
 
     $form += $this->getElementInfo('form');
     $form += array('#tree' => FALSE, '#parents' => array());
-    $form['#validate'][] = array($form_state['build_info']['callback_object'], 'validateForm');
-    $form['#submit'][] = array($form_state['build_info']['callback_object'], 'submitForm');
+    if (isset($form_state['build_info']['callback_object'])) {
+      $form['#validate'][] = array($form_state['build_info']['callback_object'], 'validateForm');
+      $form['#submit'][] = array($form_state['build_info']['callback_object'], 'submitForm');
+    }
 
     // If no #theme has been set, automatically apply theme suggestions.
     // theme_form() itself is in #theme_wrappers and not #theme. Therefore, the
diff --git a/core/modules/field_ui/src/Form/FieldEditForm.php b/core/modules/field_ui/src/Form/FieldEditForm.php
index aea0a64..9d79cf4 100644
--- a/core/modules/field_ui/src/Form/FieldEditForm.php
+++ b/core/modules/field_ui/src/Form/FieldEditForm.php
@@ -153,8 +153,6 @@ public function buildForm(array $form, array &$form_state, FieldInstanceConfigIn
 
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array('#type' => 'submit', '#value' => $this->t('Save field settings'));
-    $form['#submit'][] = array($this, 'submitForm');
-    $form['#validate'][] = array($this, 'validateForm');
     return $form;
   }