👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-07

react-native context-api navigation JavaScript

I'm trying to implement I tried several approaches but none seem to work. I'm experiencing a crash in my React-Native app when navigating between screens. The behavior message I receive is `TypeError: want to read property 'context' of null`. This seems to happen when I try to access a context value that depends on the state in my main App component. I've set up a context provider like this: ```javascript import React, { createContext, useState } from 'react'; const MyContext = createContext(); const MyProvider = ({ children }) => { const [data, setData] = useState(null); return ( <MyContext.Provider value={{ data, setData }}> {children} </MyContext.Provider> ); }; export { MyContext, MyProvider }; ``` In my App component, I'm using the provider: ```javascript import React from 'react'; import { NavigationContainer } from '@react-navigation/native'; import { MyProvider } from './MyContext'; import MainNavigator from './MainNavigator'; const App = () => { return ( <MyProvider> <NavigationContainer> <MainNavigator /> </NavigationContainer> </MyProvider> ); }; export default App; ``` I then access the context in one of my screens like this: ```javascript import React, { useContext, useEffect } from 'react'; import { MyContext } from './MyContext'; const HomeScreen = () => { const { data } = useContext(MyContext); useEffect(() => { // Simulate an async fetch setTimeout(() => { // This should set the context data setData({ message: 'Hello World' }); }, 1000); }, []); return <Text>{data ? data.message : 'Loading...'}</Text>; }; export default HomeScreen; ``` When I navigate back and forth, the app crashes intermittently. I suspect it could be related to state updates occurring after the component has unmounted. I've tried using cleanup functions in useEffect, but that doesn't seem to resolve the scenario. I've also checked that I'm not calling `setData` if the component is unmounted, but the behavior still occurs. Has anyone faced a similar scenario or have insights on how to properly manage state across screen navigations in a React-Native app? Any help would be greatly appreciated! My development environment is Linux. Any ideas what could be causing this? Is there a better approach?