PhantomJS 2.0.0 (Windows 8) ERROR. Some of your tests did a full page reload

Hi I am facing this issue with my test-cases written in PhantomJS:

PhantomJS 2.0.0 (Windows 8) ERROR. Some of your tests did a full page reload.

At one place I have window.location.href in my code (when I do not find something stored in the cookie , I redirect it to some page).

appEntryRoute:function(username, enroll){
            if(username != null || username != undefined){
                var encodeUsername = Application.utils.encodeToBase64(username);
                Application.utils.setCookie("username",encodeUsername);
                if(enroll == "true"){
                    module.getChannel("shared").then(function(ch){
                        ch.request("startSession",username);
                    });
                    Application.navigate("manage/tenant");
                } else {
                    Application.navigate("");   
                }

            } else {
                 window.location.href= Application.getConfig("logoutSuccess");
            }
        }

But it has nothing to do with my test cases and I am getting this error. If I comment the window.location.href line, the tests run fine. Can anyone please help me suggest what exactly is causing this and how to get rid of this issue?