diff --git a/app/Resources/Api/Backend/Users/User.php b/app/Resources/Api/Backend/Users/User.php
index d61ea19..dc67c71 100644
--- a/app/Resources/Api/Backend/Users/User.php
+++ b/app/Resources/Api/Backend/Users/User.php
@@ -55,7 +55,7 @@ protected function getFields()
                 ]);
             }),
 
-            Field::create('parent_email')->validates('required|string|email|different:email|max:255'),
+            Field::create('parent_email')->validates('nullable|string|email|different:email|max:255'),
             Field::create('birthday')->validates('required|date|before:today'),
             Field::create('zipcode')
                 ->validates('required|integer|exists:zipcodes,zipcode')
diff --git a/app/Resources/Api/User.php b/app/Resources/Api/User.php
index 16d7740..9966ebf 100644
--- a/app/Resources/Api/User.php
+++ b/app/Resources/Api/User.php
@@ -101,7 +101,7 @@ protected function getFields()
                 ->validates(function (Model $user) {
                     return $user->hasVerifiedEmail()
                         ? 'in:'.$user->parent_email
-                        : 'required|string|email|different:email|max:255';
+                        : 'nullable|string|email|different:email|max:255';
                 }),
 
             Field::create('description')->validates('nullable|string'),