Ticket #17514: 17514.diff

wp-admin/includes/ms.php

@@ -502 +502 @@
 
         $blogs = get_blogs_of_user( get_current_user_id() );
 
+        if ( wp_list_filter( $blogs, array( 'userblog_id' => get_current_blog_id() ) ) )
+                return;
+
         $blog_name = get_bloginfo( 'name' );
 
         if ( empty( $blogs ) )