diff --git a/web/app/controllers/user_info_edit.php b/web/app/controllers/user_info_edit.php
index a861908..8188d7b 100644
--- a/web/app/controllers/user_info_edit.php
+++ b/web/app/controllers/user_info_edit.php
@@ -133,7 +133,7 @@ EOD);
 			'label' => UOJLocale::get('email'),
 			'default_value' => $user['email'] ?: '',
 			'validator_php' => function ($email, &$vdata) {
-				if (!validateEmail($email)) {
+				if ($email && !validateEmail($email)) {
 					return 'Email 格式不合法。';
 				}