Index: wp-admin/includes/ms.php
===================================================================
--- wp-admin/includes/ms.php	(revision 14041)
+++ wp-admin/includes/ms.php	(working copy)
@@ -834,6 +834,7 @@
 
 	$user = new WP_User( $user_id );
 	if ( $user->user_email != $admin_email ) {
+		$super_admins = get_site_option( 'site_admins', array( 'admin' ) );
 		foreach ( $super_admins as $key => $username ) {
 			if ( $username == $user->user_login ) {
 				unset( $super_admins[$key] );