This content originally appeared on DEV Community and was authored by Victory Lucky
Recently, I was working with Next.js (App Router) and I encountered this warning:
Warning: Detected multiple renderers concurrently rendering the same context provider. This is currently unsupported.
I was a bit confused as I had no idea what the actual cause was but after some research and trials, I found out the cause and was able to fix it, so in this post I will be sharing the possible cause, how to prevent it and how to fix the Detected multiple renderers concurrently rendering the same context provider. This is currently unsupported warning.
This warning typically appears when using Next.js App Router with both server and client components. Let's explore the causes and solutions to resolve it effectively.
Understanding the Warning
This warning occurs when React detects the same context provider being rendered by different rendering environments (server vs client) during hydration. This is common in Next.js applications that mix server and client components while using React Context.
Cross-Environment Rendering: When a context provider is rendered in both server and client environments (e.g., in a layout shared by both).
Improper Component Boundaries: Placing context providers in server components instead of client components.
Duplicate Providers: Accidentally rendering the same provider multiple times in the component tree.
In my case, the issue was caused by a custom hook (code below) for a context provider that was in a different file which led to duplicate rendering.
Before the fix
"use client";
import { createContext } from "react";
import { SiteSettings } from "../types";
import { DEFAULT_SETTINGS } from "../lib/settings/config";
export const SiteConfigContext = createContext<SiteSettings>(DEFAULT_SETTINGS);
export function SiteConfigProvider({
children,
initialConfig,
}: {
children: React.ReactNode;
initialConfig: SiteSettings;
}) {
return (
<SiteConfigContext.Provider
value={{ ...DEFAULT_SETTINGS, ...initialConfig }}
>
{children}
</SiteConfigContext.Provider>
);
}
"use client";
import { useContext } from "react";
import { SiteConfigContext } from "../context/SiteConfig";
export const useSiteConfig = () => {
const context = useContext(SiteConfigContext);
if (!context) {
throw new Error("useSiteConfig must be used within a SiteConfigProvider");
}
return context;
};
After the fix
"use client";
import { createContext } from "react";
import { SiteSettings } from "../types";
import { DEFAULT_SETTINGS } from "../lib/settings/config";
export const SiteConfigContext = createContext<SiteSettings>(DEFAULT_SETTINGS);
export function SiteConfigProvider({
children,
initialConfig,
}: {
children: React.ReactNode;
initialConfig: SiteSettings;
}) {
return (
<SiteConfigContext.Provider
value={{ ...DEFAULT_SETTINGS, ...initialConfig }}
>
{children}
</SiteConfigContext.Provider>
);
}
import { useContext } from "react";
export const useSiteConfig = () => {
const context = useContext(SiteConfigContext);
if (!context) {
throw new Error("useSiteConfig must be used within a SiteConfigProvider");
}
return context;
};
Combining the hook with the context provider resolved the issue because this now lets the provider be rendered once.
Other Ways to Fix the Error
1. Ensure Context Providers are Client Components
All context providers must be Client Components. Explicitly mark them with 'use client':
'use client'; // Essential for context providers
import { createContext, useContext } from 'react';
export const MyContext = createContext();
export function MyProvider({ children }) {
return <MyContext.Provider value={/*...*/}>{children}</MyContext.Provider>;
}
2. Proper Provider Placement in Component Tree
Wrap your app with providers in a Client Component boundary. Never place providers in Server Components:
// app/providers.jsx
'use client';
import { MyProvider } from './my-context';
export function Providers({ children }) {
return <MyProvider>{children}</MyProvider>;
}
// app/layout.jsx (Server Component)
import { Providers } from './providers';
export default function RootLayout({ children }) {
return (
<html>
<body>
{/* Providers now only render on client */}
<Providers>{children}</Providers>
</body>
</html>
);
}
3. Avoid Duplicate Providers
Ensure providers aren't duplicated across layouts/pages. Check your component hierarchy using React DevTools.
4. Upgrade Dependencies
Some older versions have known issues. Update to at least:
- Next.js 13.4+
- React 18.2+
npm install next@latest react@latest react-dom@latest
Key Considerations for Next.js
- Root Layout is a Server Component: Never place providers directly here without a Client Component wrapper
- Third-Party Providers: Wrap them in your own Client Component:
'use client';
import { ThirdPartyProvider } from 'some-library';
export function CustomProvider({ children }) {
return <ThirdPartyProvider>{children}</ThirdPartyProvider>;
}
- Server-Side Data: Pass data from Server Components to Client Components via props:
// app/page.jsx
export default async function Page() {
const data = await getData();
return <ClientComponent data={data} />;
}
Common Pitfalls to Avoid
❌ Mixing Providers in Server Components:
// app/layout.jsx
import { ClientProvider } from './client-provider';
export default function Layout({ children }) {
// Will cause warning - layout is Server Component
return (
<html>
<body>
<ClientProvider>{children}</ClientProvider>
</body>
</html>
);
}
✅ Correct Approach:
// app/providers.jsx
'use client';
export function AllProviders({ children }) {
return (
<Provider1>
<Provider2>{children}</Provider2>
</Provider1>
);
}
// app/layout.jsx
import { AllProviders } from './providers';
export default function Layout({ children }) {
return (
<html>
<body>
<AllProviders>{children}</AllProviders>
</body>
</html>
);
}
Summary
To resolve the multiple renderers warning:
- Ensure all context providers are Client Components
- Properly separate providers in Client Component boundaries
- Avoid duplicate providers in the component tree
- Keep dependencies updated
By following these steps, you'll be able to fix the "Detected multiple renderers concurrently rendering the same context provider. This is currently unsupported" warning.
If you found this tutorial helpful, feel free to share it with others. And don’t forget to follow me on Twitter for more web development tips and tutorials.
Happy coding! 🚀
Connect with Me
- Portfolio: devvick.online
- GitHub: github.com/lucky-victory
- Twitter: @CodewithVick
This content originally appeared on DEV Community and was authored by Victory Lucky
Victory Lucky | Sciencx (2025-01-25T22:17:44+00:00) How to Fix the “Detected Multiple Renderers Concurrently Rendering the Same Context Provider” Warning in Next.js. Retrieved from https://www.scien.cx/2025/01/25/how-to-fix-the-detected-multiple-renderers-concurrently-rendering-the-same-context-provider-warning-in-next-js/
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