update.php?op=info show one menu.inc Error

when I navigate for the first time to update.php my Drupal 5.7, in update.php?op=info give one 'user warning'.

    * user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY fit DESC LIMIT 0, 1' at line 1 query: SELECT * FROM drupal_menu_router WHERE path IN () ORDER BY fit DESC LIMIT 0, 1 in C:\Program Files\VertrigoServ\www\includes\menu.inc on line 316.
    * user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY fit DESC LIMIT 0, 1' at line 1 query: SELECT * FROM drupal_menu_router WHERE path IN () ORDER BY fit DESC LIMIT 0, 1 in C:\Program Files\VertrigoServ\www\includes\menu.inc on line 316.
    * user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY fit DESC LIMIT 0, 1' at line 1 query: SELECT * FROM drupal_menu_router WHERE path IN () ORDER BY fit DESC LIMIT 0, 1 in C:\Program Files\VertrigoServ\www\includes\menu.inc on line 316.

The error is in this:
SELECT * FROM {menu_router} WHERE path IN ('.implode (',', $placeholders).') ORDER BY fit DESC'

implode (',', $placeholders) returns "".

Why update.php call menu.inc?

Info: without any contrib modules/themes, I don't try to upgrade yet.