diff --git a/lib/server/rest/markdown.js b/lib/server/rest/markdown.js
index c6e386c2..17d170c3 100644
--- a/lib/server/rest/markdown.js
+++ b/lib/server/rest/markdown.js
@@ -7,16 +7,28 @@
         
         fs          = require('fs'),
         
-        Util        = require(DIR_LIB + 'util'),
         root        = require(DIR + 'root'),
         pipe        = require('pipe-io'),
         ponse       = require('ponse'),
         markdown    = require('markdown-it')();
     
+    function check(name, request, callback) {
+        if (typeof name !== 'string')
+            throw(Error('name should be string!'));
+        
+        else if (!request)
+            throw(Error('request could not be empty!'));
+        
+        else if (typeof callback !== 'function')
+            throw(Error('callback should be function!'));
+    }
+    
     module.exports  = function(name, request, callback) {
         var query,
             method = request.method;
         
+        check(name, request, callback);
+        
         switch(method) {
             case 'GET':
                 name    = name.replace('/markdown', '');
@@ -38,7 +50,7 @@
             case 'PUT':
                 pipe.getBody(request, function(error, data) {
                     if (error)
-                        Util.exec(callback, error);
+                        callback(error);
                     else
                         parse(data, callback);
                 });