           params = { 'profile.nickname' : userFormData.username }
           
           JAccount.one params, (err, { data : {profile} }) ->
-            expect(err)             .to.be.null
+            expect(err)             .to.not.exist
             expect(profile.nickname).to.be.equal userFormData.username
 
             queue.next()

        
        ->
          JUser.convert client, userFormData, (err) ->
            expect(err).to.be.null

            queue.next()


        
        ->
          JUser.convert client, userFormData, (err) ->
            expect(err).to.not.exist

            queue.next()
        
