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copied!<p>This probably is a bug in identity OWIN extension code. I can't repro the issue as my facebook payload always returns a username field in json, which is missing from your fb response. I am not quite sure why it's not there.</p> <p>The code in identity owin extension method doesn't have a null check for the identity's name claim which is same as the username field. We have filed a bug for it internally.</p> <p>In order to workaround this issue, could you try replacing your ExternalLoginCallback method with following code:</p> <pre><code> [AllowAnonymous] public async Task<ActionResult> ExternalLoginCallback(string returnUrl) { var result = await AuthenticationManager.AuthenticateAsync(DefaultAuthenticationTypes.ExternalCookie); if (result == null || result.Identity == null) { return RedirectToAction("Login"); } var idClaim = result.Identity.FindFirst(ClaimTypes.NameIdentifier); if (idClaim == null) { return RedirectToAction("Login"); } var login = new UserLoginInfo(idClaim.Issuer, idClaim.Value); var name = result.Identity.Name == null ? "" : result.Identity.Name.Replace(" ", ""); // Sign in the user with this external login provider if the user already has a login var user = await UserManager.FindAsync(login); if (user != null) { await SignInAsync(user, isPersistent: false); return RedirectToLocal(returnUrl); } else { // If the user does not have an account, then prompt the user to create an account ViewBag.ReturnUrl = returnUrl; ViewBag.LoginProvider = login.LoginProvider; return View("ExternalLoginConfirmation", new ExternalLoginConfirmationViewModel { UserName = name }); } } </code></pre> <p>The code will set default user name as empty when there is no username back from facebook/google. </p>

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