`deserializeUser` is not called when session was not found in DB. Is it correct behavior?

[wzup]

I discovered that deserializeUser is not called if session was not found in a DB by express-mysql-session. Is it correct behavior?

Use case:

I'm using passport-local with session = true and with express-mysql-session as a session store. When session is ok (found by express-mysql-session in a DB) then deserializeUser is called all right. However if a session for some reason isn't found in a DB (eg. session cookie is manually deleted in a browser or a session row is manually deleted from DB) then deserializeUser doesn't get called. Why? Is it correct behavior?