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I'm working on a Next.js 15 App Router project with a POST API route located at app/api/users/webhook/route.ts. In production (on Vercel), the build and API route work perfectly. But locally, when I run npm run build, I get this error:

TypeError: Cannot read properties of undefined (reading 'query')
    at new nH (.next/server/app/api/users/webhook/route.js:40:4398)
    at nJ.createSession (...)
    ...
Error: Failed to collect page data for /api/users/webhook

package.json

I'm using bun locally but running npm in CI and Vercel:

"scripts": {
  "build": "next build",
  ...
}
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  • Please provide enough code so others can better understand or reproduce the problem. Commented Jun 30 at 14:24
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