Bug: Duplicate in menu

This menu code is run twice for some reason and is causing the "Blog Templates" to show two times in the menu.

function network_admin_page() {
add_submenu_page( 'settings.php', __( 'Blog Templates', $this->localization_domain ), __( 'Blog Templates', $this->localization_domain ), 'administrator', basename(__FILE__), array(&$this,'admin_options_page'));
}