ProSite Bug in get_blog_id() function

There is a bug in ProSites_Helper_ProSite::get_blog_id() function. The activation_key parameter is a string but it is passed as integer in the query. It is not getting the correct blog id. Please fix:

$row = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->signups WHERE activation_key = %d", $activation_key ) );

to

$row = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->signups WHERE activation_key = %s", $activation_key ) );

Thanks