Can't perform a React state update on a component that hasn't mounted yet.

[florian-lefebvre]

I'm adding Keystatic to an existing Astro app. I've followed the guide, except for SSR:

• I set output to hybrid
• I added export const prerender = false to both src/pages/keystatic/[...params].astro and src/pages/api/keystatic/[...params].ts

(Btw I think this option should be added to guide as well)

When going to http://127.0.0.1:3000/keystatic, I get the following warning:

Warning: Can't perform a React state update on a component that hasn't mounted yet. This indicates that you have a side-effect in your render function that asynchronously later calls tries to update the component. Move this work to useEffect instead.

Nothing's broken, but I thought I'd mention it anyway

[jossmac]

Pretty sure this was related to some old SSR stuff from before #377. LMK if it comes up again and i'll re-open.