Not useful logs in vercel staging deploy

[aloukissas]

Hi there

I'm getting a 500 for an SSR page that uses secrets via environment, although it works perfectly with now dev locally. The logs really don't have much to help me move forward. Any help appreciated:

`
11:14:36.007
Error: Minified React error #152; visit https://reactjs.org/docs/error-decoder.html?invariant=152&args[]=Header for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
11:14:36.007
at Za (/zeit/376e481e/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:35:465)
11:14:36.007
at d (/zeit/376e481e/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:37:55)
11:14:36.007
at $a (/zeit/376e481e/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:39:16)
11:14:36.008
at a.b.render (/zeit/376e481e/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:44:476)
11:14:36.008
at a.b.read (/zeit/376e481e/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:44:18)
11:14:36.008
at renderToString (/zeit/376e481e/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:54:364)
11:14:36.008
at render (/zeit/376e481e/node_modules/next/dist/next-server/server/render.js:83:16)
11:14:36.008
at Object.renderPage (/zeit/376e481e/node_modules/next/dist/next-server/server/render.js:406:16)
11:14:36.008
at Function.getInitialProps (/zeit/376e481e/.next/serverless/pages/index.js:1792:19)
11:14:36.008
at Object.loadGetInitialProps (/zeit/376e481e/node_modules/next/dist/next-server/lib/utils.js:59:29)
11:14:36.014
Error occurred prerendering page "/". Read more: https://err.sh/next.js/prerender-error:
11:14:36.014
Error: Failed to render serverless page
11:14:36.052

Build error occurred
11:14:36.056
Error: Export encountered errors
11:14:36.056
at _default (/zeit/376e481e/node_modules/next/dist/export/index.js:19:1086)
11:14:36.056
at runMicrotasks ()
11:14:36.056
at processTicksAndRejections (internal/process/task_queues.js:94:5)
11:14:36.056
at async build (/zeit/376e481e/node_modules/next/dist/build/index.js:35:218)
`

[styfle]

Hi @aloukissas

The error message has a couple links with more details.

https://reactjs.org/docs/error-decoder.html?invariant=152&args%5B%5D=Header

Header(...): Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null.

---

https://err.sh/next.js/prerender-error

Why This Error Occurred

While prerendering a page an error occurred. This can occur for many reasons from adding non-pages e.g. components to your pages folder or expecting props to be populated which are not.

Possible Ways to Fix It

• Make sure to move any non-pages out of the pages folder
• Check for any code that assumes a prop is available even when it might not be
• Check for any out of date modules that you might be relying on

[aloukissas]

One more hint: I'm using now secrets, which I'm exposing in a now.json file. Do I also need a next.config.js file for this? The docs are a bit confusing.

[styfle]

Yes you will need to update next.config.js.

See this example https://github.com/zeit/next.js/tree/canary/examples/with-now-env

[styfle]

Also note that we recently announced the environment variable dashboard.

You can remove now.json and instead use the dashboard.

https://zeit.co/blog/environment-variables-ui

[aloukissas]

That's a bummer. Why remove the code-as-config option? It was great being able to config a project w/o going to the dashboard (and have it version-controlled).

[styfle]

Why remove the code-as-config option?

This is not code, these are secrets. The values were never stored in now.json.

We improved the workflow from development to be git pull and now env pull and everyone on team gets the latest code and latest environment variables with secrets.