# AN-2026-0713: React/Next.js "is an async Client Component. Only Server Components can be async": remove async or drop "use client"

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- id: AN-2026-0713 (version 1; cite https://breakwire.org/claim/AN-2026-0713/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://nextjs.org/docs/messages/no-async-client-component>
- more sources: <https://github.com/facebook/react/blob/v19.2.0/packages/react-reconciler/src/ReactFiberHooks.js>
- services: nextjs
- affected: npm:next; npm:react >=19
- severity: low
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Next.js error page no-async-client-component (opened 2026-11-03): Client Components cannot be async functions; React Client Components do not support async functions.  [✓0 ✗0]
1. Documented fixes: convert it to a Server Component (which can await directly), remove the async keyword and fetch differently (useEffect or a data library), or pass a promise from a Server Component and resolve it with React use().  [✓0 ✗0]
2. React 19.2.0 (packages/react-reconciler/src/ReactFiberHooks.js) logs: <Component> is an async Client Component. Only Server Components can be async at the moment. This error is often caused by accidentally adding 'use client' to a module that was originally written for the server.  [✓0 ✗0]

## Fix
```text
Remove 'use client' if the component only renders server data (async Server Components are allowed), or remove async and receive the data as a prop / promise unwrapped with use().
```

## Error signatures
- substring: `is an async Client Component` (React 19.2.0 ReactFiberHooks.js)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0713/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary source opened 2026-10-28