#Help

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iron pythonBOT
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Hi @worn mulch. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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This error isn’t described directly in the knowledge sources, but they do show that @react-three/fiber + React 19 / Next 15 can cause low‑level React errors if something is off in the setup. [r3f issue]

From what is documented:

  1. Version mismatch can break @react-three/fiber
    In the linked issue, the reporter later notes “The issue was with the React 19”. [r3f issue]
    If you’re on React 19 RC with @react-three/fiber that isn’t compatible, you can get internal React errors like the one you’re seeing.

  2. First thing to check

    • Ensure react, react-dom, next, @react-three/fiber, and @react-three/drei are on versions known to work together.
    • If you’re on React 19 RC, try downgrading to the stable React 18 line and reinstalling dependencies.

  3. If the problem persists
    The maintainers explicitly ask for a minimal reproduction repo when they can’t reproduce a @react-three/fiber issue. [r3f repro]

    • Create a tiny Next.js app with just:
      // app/page.tsx or pages/index.tsx
"use client";

import { Canvas } from "@react-three/fiber";

export default function Page() {
  return (
    <Canvas>
      {/* empty scene */}
    </Canvas>
  );
}
    • If this alone throws the same ReactCurrentOwner error, it’s almost certainly a version / compatibility problem.

Because the sources don’t contain a confirmed fix for this exact ReactCurrentOwner error, I can’t point to a specific patch in Next.js or @react-three/fiber. The best supported guidance from the sources is:

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  • Align your React / Next / @react-three/fiber versions (avoid React 19 RC if your 3D stack doesn’t support it yet). [r3f issue]
  • If that doesn’t resolve it, prepare a minimal public reproduction and open an issue so maintainers can investigate. [r3f repro]

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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@worn mulch Kapa.ai is still learning and improving, please let me know how I did by reacting below.

worn mulch
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@iron python and how do i downgrade.._ forgot lol

iron pythonBOT
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Let me check the knowledge base for you again. Give me one moment! :books:

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To downgrade React (and React DOM) in a Next.js app, the knowledge sources only show one concrete example: downgrading from React 19 to React 18 to avoid build/runtime issues. [React 19 build bug]

Use this in your project root:

npm install react@18 react-dom@18 @types/react@18 @types/react-dom@18

That’s the exact command shown as the recommended downgrade path. [React 19 build bug]

After that:

rm -rf .next node_modules
npm install
npm run dev

If your issue was caused by React 19 incompatibility with @react-three/fiber, this downgrade path is what the sources suggest.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: