why HttpContext.Current.User Could not be initialized is reurn null - asp.net-mvc

Question

I'm using this code for Authentication mvc .I am login but Context.User is null when trace project show current.user null.
I think Context.User Could not be initialized
how sloved this problem
protected void Application_AuthenticateRequest(Object sender, EventArgs e)
{
if (Context.User == null)
return;
var userService = ObjectFactory.GetInstance<IUserService>();
var userStatus = userService.GetStatus(Context.User.Identity.Name);
if (userStatus.IsBaned)
FormsAuthentication.SignOut();
var authCookie = Context.Request.Cookies[FormsAuthentication.FormsCookieName];
if (authCookie == null || authCookie.Value == "")
return;
var authTicket = FormsAuthentication.Decrypt(authCookie.Value);
// retrieve roles from UserData
if (authTicket == null) return;
var roles = authTicket.UserData.Split(',');
if (userStatus.Role != roles[0])
FormsAuthentication.SignOut();
Context.User = new GenericPrincipal(Context.User.Identity, roles);
}
private void SetAuthCookie(string userName, string roleofUser, bool presistantCookie)
{
var timeout = presistantCookie ? FormsAuthentication.Timeout.TotalMinutes : 30;
var now = DateTime.UtcNow.ToLocalTime();
var expirationTimeSapne = TimeSpan.FromMinutes(timeout);
var authTicket = new FormsAuthenticationTicket(
1,
userName,
now,
now.Add(expirationTimeSapne),
presistantCookie,
roleofUser,
FormsAuthentication.FormsCookiePath
);
var encryptedTicket = FormsAuthentication.Encrypt(authTicket);
var authCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket)
{
HttpOnly = true,
Secure = FormsAuthentication.RequireSSL,
Path = FormsAuthentication.FormsCookiePath
};
if (FormsAuthentication.CookieDomain != null)
{
authCookie.Domain = FormsAuthentication.CookieDomain;
}
if (presistantCookie)
authCookie.Expires = DateTime.Now.AddMinutes(timeout);
Response.Cookies.Add(authCookie);
}