diff --git a/docs/en/02_Developer_Guides/03_Forms/01_Validation.md b/docs/en/02_Developer_Guides/03_Forms/01_Validation.md
index 4b4776c57..a3a049f3d 100644
--- a/docs/en/02_Developer_Guides/03_Forms/01_Validation.md
+++ b/docs/en/02_Developer_Guides/03_Forms/01_Validation.md
@@ -166,8 +166,10 @@ class Page_Controller extends ContentController
         $check = Member::get()->filter('Email', $data['Email'])->first();
 
         if ($check) {
-            $form->addErrorMessage('Email', 'This email already exists', 'bad');
-
+            $validationResult = new ValidationResult();
+            $validationResult->addFieldError('Email', 'This email already exists');
+            $form->setSessionValidationResult($validationResult);
+            $form->setSessionData($form->getData());
             return $this->redirectBack();
         }