Index: edit.php
===================================================================
--- edit.php	(revision 17333)
+++ edit.php	(working copy)
@@ -356,7 +356,8 @@
 
 		check_admin_referer( 'deleteuser' );
 
-		if ( $id != '0' && $id != '1' ) {
+		$is_super_admin = is_super_admin( $id ); //Boolean true or false
+		if ( ( true == $is_super_admin AND ( 1 < count( get_super_admins() ) ) ) OR false == $is_super_admin ) {
 			$_POST['allusers'] = array( $id ); // confirm_delete_users() can only handle with arrays
 			$title = __( 'Users' );
 			$parent_file = 'users.php';