diff --git a/form.php b/form.php
index 132452b..b8b4a6a 100644
--- a/form.php
+++ b/form.php
@@ -343,7 +343,8 @@ class form
     * @param array $values The values of the fields filled by the user
     * @param array $errors The errors detected by a verify
     * @param object $route the route object
-    * @param string $url The URL to redirect
+    * @param string|null $url The URL to redirect. If not provided, use the
+    * $route->requestURL () method to found the calling page
     *
     * Example :
       $form = new \form ();
@@ -355,11 +356,13 @@ class form
       $spaceuuid = $spaceObj->spaceCreateConceal ($values["spacename"]);
       $route->redirect ("/admin/space/");
     */
-  public function redirectIfError ($values, $errors, $route, $url)
+  public function redirectIfError ($values, $errors, $route, $url = "")
   {
     $this->saveValuesErrors ($values, $errors);
+    if ($url === "")
+      $url = "/".$route->requestURL ();
     if (count ($errors)) $route->redirect ($url);
-    $form->saveValuesErrorsReset ();
+    $this->saveValuesErrorsReset ();
   }
 
   /** Save the values and errors to be displayed in the next page if the session