Expired CSRF token in the login form

Hello,

How would you handle an expired CSRF token in a login form, which leads to a 419 error? Currently what I do is an ugly "solution" which is to catch a 419 error and simply refresh the login form when a user tries to login, then he needs to put his credentials again.

But is there a better way to do it, i.e., detect an expired token, regenerate the token and re-send the login form? Or that wouldn't be secured?

This rarely happens, it only happens if a user left his browser open for example, but still wanted a better approach

Thanks