Error when deploying the front-end app to Vercel

[taha-me]

Hi there,

when I deploy to Vercel, I got these errors:

14:22:34.674	Error occurred prerendering page "/en". Read more: https://nextjs.org/docs/messages/prerender-error
14:22:34.674	TypeError: Cannot read property 'text' of null
14:22:34.674	at /vercel/path0/.next/server/pages/[[...slug]].js:3147:36
14:22:34.674	at Array.map (<anonymous>)
14:22:34.674	at FeatureRowsGroup (/vercel/path0/.next/server/pages/[[...slug]].js:3126:29)
14:22:34.674	at d (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:33:498)
14:22:34.674	at bb (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:36:16)
14:22:34.674	at a.b.render (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:42:43)
14:22:34.674	at a.b.read (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:41:83)
14:22:34.674	at exports.renderToString (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:52:138)
14:22:34.674	at Object.renderPage (/vercel/path0/node_modules/next/dist/next-server/server/render.js:54:854)
14:22:34.674	at Function.getInitialProps (/vercel/path0/.next/server/pages/_document.js:761:19)
14:22:35.200	info - Generating static pages (4/8)
14:22:35.216	Not Found
14:22:35.217	Error occurred prerendering page "/fr/[[...slug]]". Read more: https://nextjs.org/docs/messages/prerender-error
14:22:35.217	Error: An error occured please try again
14:22:35.217	at fetchAPI (/vercel/path0/.next/server/pages/_app.js:574:11)
14:22:35.217	at processTicksAndRejections (internal/process/task_queues.js:93:5)
14:22:35.217	at async getGlobalData (/vercel/path0/.next/server/pages/_app.js:601:18)
14:22:35.217	at async Function.module.exports.1TCz.MyApp.getInitialProps (/vercel/path0/.next/server/pages/_app.js:299:24)
14:22:35.217	at async loadGetInitialProps (/vercel/path0/node_modules/next/dist/next-server/lib/utils.js:5:91)
14:22:35.217	at async renderToHTML (/vercel/path0/node_modules/next/dist/next-server/server/render.js:28:1494)
14:22:35.217	at async /vercel/path0/node_modules/next/dist/export/worker.js:26:6
14:22:35.217	at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/telemetry/trace/trace.js:5:584)
14:22:35.241	info - Generating static pages (6/8)
14:22:35.746	Not Found
14:22:35.747	Error occurred prerendering page "/fr/500". Read more: https://nextjs.org/docs/messages/prerender-error
14:22:35.747	Error: An error occured please try again
14:22:35.747	at fetchAPI (/vercel/path0/.next/server/pages/_app.js:574:11)
14:22:35.747	at processTicksAndRejections (internal/process/task_queues.js:93:5)
14:22:35.747	at async getGlobalData (/vercel/path0/.next/server/pages/_app.js:601:18)
14:22:35.747	at async Function.module.exports.1TCz.MyApp.getInitialProps (/vercel/path0/.next/server/pages/_app.js:299:24)
14:22:35.747	at async loadGetInitialProps (/vercel/path0/node_modules/next/dist/next-server/lib/utils.js:5:91)
14:22:35.747	at async renderToHTML (/vercel/path0/node_modules/next/dist/next-server/server/render.js:28:1494)
14:22:35.747	at async /vercel/path0/node_modules/next/dist/export/worker.js:26:6
14:22:35.747	at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/telemetry/trace/trace.js:5:584)
14:22:35.760	info - Generating static pages (8/8)
14:22:35.763	> Build error occurred
14:22:35.763	Error: Export encountered errors on following paths:
14:22:35.763	/en
14:22:35.763	/fr/500
14:22:35.763	/fr/[[...slug]]
14:22:35.763	at /vercel/path0/node_modules/next/dist/export/index.js:31:1106
14:22:35.763	at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/telemetry/trace/trace.js:5:584)
14:22:35.763	at async /vercel/path0/node_modules/next/dist/build/index.js:43:49
14:22:35.764	at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/telemetry/trace/trace.js:5:584)
14:22:35.764	at async /vercel/path0/node_modules/next/dist/build/index.js:25:1475
14:22:35.764	at async Span.traceAsyncFn (/vercel/path0/node_modules/next/dist/telemetry/trace/trace.js:5:584)
14:22:35.807	error Command failed with exit code 1.
14:22:35.807	info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
14:22:35.824	Error: Command "yarn run build" exited with 1

Please let me know what is the issue here, thanks

[gregflint]

npm run build produces the same error as well.

[taha-me]

So, I found the reason for the first issue here... when adding a new row to feature-rows-group on the home page of the Strapi backend, there should a value in the "text" field.

If not, Strapi will send "null" and Vercel app will break at the build process.

The solution is that Strapi backend should make this field mandatory, or adjust Next.js app to deal with empty "text" field.

[remidej]

Hey @taha-me, do you think the field that should be required would be this one?