Having issue with document title

I create an app with SSR with choo and expressjs.

So my template is using choo's html with full html tag, with head and body. In head tag, I create a title tag and yes it set up the title perfectly after SSR.

But, after I load the client-side bundle ( choojs ), the title in the tab is changed to undefined(localhost:xxxx). I already try changing it using document.title inside DOMContentLoaded but still no change in the title. I use state.title = xxx to inside it, but still no luck.

Anybody can give me an example of title changing in choojs?