index.coffee.diff

diff --git a/script/index.coffee b/script/index.coffee
index 4f56d19..f81fd44 100644
--- a/script/index.coffee
+++ b/script/index.coffee
@@ -507,6 +507,7 @@ api.wrap = (user, main=true) ->
       sortTask: (req, cb) ->
         {id} = req.params
         {to, from} = req.query
+        return cb?() if to is from
         task = user.tasks[id]
         return cb?({code:404, message: i18n.t('messageTaskNotFound', req.language)}) unless task
         return cb?('?to=__&from=__ are required') unless to? and from?
@@ -550,6 +551,7 @@ api.wrap = (user, main=true) ->
 
       sortTag: (req, cb) ->
         {to, from} = req.query
+        return cb?(null) if to is from
         return cb?('?to=__&from=__ are required') unless to? and from?
         user.tags.splice to, 0, user.tags.splice(from, 1)[0]
         cb? null, user.tags