[BUG] next 15.2.0 breaks non static routes

[makepanic]

Describe the bug

I've upgraded my app to next 15.2.0 and now i'm getting a 500 on some routes.

From a quick check it seems to only happen on the routes that don't use generateStaticParams

✘ [ERROR] ⨯ Error: Invariant: renderHTML should not be called in minimal mode

      at Object.renderHTMLImpl
  (/path/to/proj/.wrangler/tmp/dev-Cd8zgp/worker.js)
      at <unknown>
  (/path/to/proj/.wrangler/tmp/dev-Cd8zgp/worker.js)
      at Object.trace
  (/path/to/proj/.wrangler/tmp/dev-Cd8zgp/worker.js)
      at Object.renderHTML
  (/path/to/proj/.wrangler/tmp/dev-Cd8zgp/worker.js)
      at doRender
  (/path/to/proj/.wrangler/tmp/dev-Cd8zgp/worker.js)
      at responseGenerator
  (/path/to/proj/.wrangler/tmp/dev-Cd8zgp/worker.js)
      at Object.get
  (/path/to/proj/.wrangler/tmp/dev-Cd8zgp/worker.js)
      at Object.renderToResponseWithComponentsImpl

Versions of opennext/next/vercel:

"next": "^15.2.0",
"@opennextjs/aws": "^3.5.0",
"@opennextjs/cloudflare": "^0.5.7",
"vercel": "^41.3.0",

Steps to reproduce

1. create a route without generateStaticParams
2. run opennextjs-cloudflare && wrangler dev
3. open in browser and see error 500

Expected behavior

1. no 500 should be thrown for non static routes

@opennextjs/cloudflare version

0.5.7

Wrangler version

3.111.0

next info output

Operating System:
  Platform: linux
  Arch: x64
  Version: #1 SMP PREEMPT_DYNAMIC Thu, 27 Feb 2025 18:09:44 +0000
  Available memory (MB): 31302
  Available CPU cores: 16
Binaries:
  Node: 20.18.2
  npm: 10.8.2
  Yarn: 1.22.19
  pnpm: 10.1.0
Relevant Packages:
  next: 15.2.0 // Latest available version is detected (15.2.0).
  eslint-config-next: 15.2.0
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.8.2
Next.js Config:
  output: N/A

Additional context

No response

[slawton3]

+1 getting this too

[LubomirGeorgiev]

+1 I am also getting this error

[twoolworth]

Also receiving this issue, I'm trying to use dynamic routes.

This page works at /app/static/page.tsx:

export default function StaticPage() {
    return <h1>This is a static page</h1>;
}

This page never works regardless of whether I make it client side, here's an example of client side at /app/static/[id]/page.tsx:

'use client';
import { useParams } from 'next/navigation';

export default function StaticIdPage() {
    const params = useParams<{ id: string }>();

    return <h1>Static Page: {params.id}</h1>;
}

• Tried Wrangler version 3.111.0 & 3.112.0
• Tried @opennextjs/cloudflare version 0.5.7 & 0.5.8

I've tried adding various exports to the top of pages like the following which make no difference:

export const dynamic = 'force-dynamic';
export const runtime = 'nodejs';

I've tried figuring out where the request is dying by running build worker and then updating worker.js to have the following:

console.log('Worker started.');

addEventListener('fetch', (event) => {
  console.log('🔥 Incoming request:', event.request.url);
  
  // Respond immediately so we can see if the worker is running
  event.respondWith(
    new Response('Worker is handling this request.', {
      headers: { 'Content-Type': 'text/plain' }
    })
  );
});

Only "Worker started" is ever logged to the console so I don't even think it got to my page's code.

I've tried completely removing the .open-next folder completely to ensure no stale artifacts from previous versions are causing issues.

I added a middleware.ts file with the following just to log requests, the middleware did log the request hit for the dynamic route but the request seems to die somewhere after the middleware.

import { NextResponse } from 'next/server';

export function middleware(request: Request) {
    console.log('Middleware hit:', request.url);
    return NextResponse.next();
}

[makepanic]

Same thing happens with the recently released 15.2.1 from the looks of it

[vicb]

I took a quick look at this issue.

One problem is that loadManifest is called ti load /.next/dynamic-css-manifest.json and we don't have this manifest inlined.

[timReynolds]

Downgrading to 15.1.7 fixed this

[kostandy]

Downgrading to 15.1.7 fixed this

Confirm. It works after downgrading to 15.1.7

[twoolworth]

What other versions were you using? I tried deleting my node_modules, .next, and .open-next folder and changing package references to 15.1.7 and was still having the same issue. I'm guessing I'm either doing something different in my project it doesn't like or there's a version of wrangler or open-next that needs to coincide with it.