Error: Can't set headers after they are sent to the client

[Code0987]

https://github.com/Angular-RU/angular-universal-starter/blob/d0b4b2a05a9d32c52562cf364261669bffde873c/server.ts#L61

The above code can cause express error Error: Can't set headers after they are sent to the client in some cases.

I think next() was still called even after res.redirect calls happened, not sure if it is intended.