# Next.js build worker exited with code: 1 How to fix it.

URL: https://antideploy.com/blog/nextjs-build-worker-exited-with-code-1

The Next.js build worker crashed. The lines above the message usually name the file it was compiling.

**What you see**

```
> Build error occurred
Next.js build worker exited with code: 1 and signal: null
```

## At a glance

- **What it means**: The build process crashed
- **First look**: The lines above the message
- **Another cause**: Running out of memory
- **Test locally**: Run npm run build

Published 7 October 2026. Facts checked 7 October 2026. 1 min read.

## What it means

`next build` does its heavy work in a separate worker process. When that process crashes, Next.js reports only the exit code. It does not name the cause in this line. The cause is in the lines just above it.

## How to fix it

### 1. Read the lines above the message

They normally quote the file that was being compiled, or a thrown error. That file is the place to start. Your agent can read the build log from the deploy history.

### 2. Run the same build on your machine

Run `npm run build` locally. If it fails there too, fix that error first. If it passes, the cause is the environment, so continue below.

### 3. Check memory on a large project

A large project can run the build out of memory. Look for a dependency that is pulled in and does not need to be, or very large files in the bundle.

## Common causes

- **A thrown error in a route or component.** The error is printed above the exit code.
- **A variable read at import time.** See [Failed to collect page data](https://antideploy.com/blog/nextjs-failed-to-collect-page-data).
- **Out of memory.** See [JavaScript heap out of memory](https://antideploy.com/blog/javascript-heap-out-of-memory-during-the-build).
- **A type error.** See [TypeScript errors fail the build](https://antideploy.com/blog/typescript-error-fails-the-build).

## Build worker questions, answered.

Anything else? Write to us and a person answers.

[support@antideploy.com](mailto:support@antideploy.com)

### Is this a problem on Antideploy's side?

Usually not. When a failure is on Antideploy's side, the failure reason says so, and Antideploy builds the same version again for you at no cost.

### Does this failed deploy cost anything?

No. Failed deploys never count against your plan.

### How do I read the build log?

Ask your agent to read the last failed deploy's build log and tell you which file it was compiling. The deploy history keeps the end of the build log.

## More guides, and the platform.

Each platform page covers one part of Antideploy: what it does, where it stops and the questions people ask. [See the whole platform](https://antideploy.com/platform), or [all the guides](https://antideploy.com/blog).

- [How to deploy a Next.js app with a backend and database](https://antideploy.com/blog/how-to-deploy-a-nextjs-app-with-a-backend-and-database): API routes, Postgres and Prisma. What runs, how migrations work, and why builds fail on environment variables.
- [FATAL ERROR: JavaScript heap out of memory](https://antideploy.com/blog/javascript-heap-out-of-memory-during-the-build): The build ran out of memory, usually from a very large bundle. Shrink it or raise Node's limit.
- [TypeScript error fails the build](https://antideploy.com/blog/typescript-error-fails-the-build): A type error stops the build even when the app runs locally in dev mode. Run the type check and fix it.

- [Logs and monitoring](https://antideploy.com/platform/logs-and-monitoring)
- [Deployments](https://antideploy.com/platform/deployments)
- [Hosting](https://antideploy.com/platform/hosting)

Facts on this page were checked against the live platform on 7 October 2026.

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