[9.5.6-canary.13][notFound] custom 404-page rendering crashes in prod mode

[rokinsky]

Bug report

Describe the bug

I use the experimental unstable_notFound feature on SSG/ISG pages and it fails in production mode when the custom-404 page uses getStaticProps.

To Reproduce

Repository: next.js-bug-not-found
Steps to reproduce the behavior:

1. yarn build && yarn start
2. Go to http://localhost:3000
3. See Internal Server Error

Expected behavior

Displaying "not-found" with 404 status code.

Screenshots

System information

• OS:macOS
• Browser (if applies): chrome
• Version of Next.js: 9.5.6-canary.13
• Version of Node.js: v10.22.1

Additional context

Works fine in dev mode.

[balazsorban44]

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