diff --git modules/user/user.module modules/user/user.module
index 7d5a137..2e12c17 100644
--- modules/user/user.module
+++ modules/user/user.module
@@ -2510,7 +2510,7 @@ if (Drupal.jsEnabled) {
 }
 
 function user_register_validate($form, &$form_state) {
-  user_module_invoke('validate', $form_state['values'], $form_state['values'], 'account');
+  user_module_invoke('validate', $form_state['values'], (object) $form_state['values'], 'account');
 }
 
 /**