diff --git a/www/index.php b/www/index.php
index 7adb50a..f85f260 100644
--- a/www/index.php
+++ b/www/index.php
@@ -415,12 +415,20 @@ try
             ->setName( 'series_of_letters' );
         $router->add
             (
-                '/series_of_letter/:action/{id:[0-9]+}',
+                '/series_of_letter/:action',
                 [
                     'controller'    => 'series_of_letters',
                     'action'        => 1,
                 ]
             );
+        $router->add
+        (
+            '/series_of_letter/:action/{id:[0-9]+}',
+            [
+                'controller'    => 'series_of_letters',
+                'action'        => 1,
+            ]
+        );
         ////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 
--
libgit2 0.21.4