expo: Cannot read property 'useMemo' of null

Minimal reproducible example

https://github.com/bestform/expo-router-bug

Which package manager are you using? (Yarn is recommended)

npm

If the issue is web-related, please select the bundler (web.bundler in the app.json)

None

Summary

When using expo-router 3.4.9, the app does not start. Instead it says: TypeError: Cannot read property 'useMemo' of null

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What I did:

npx create-expo-app -t As a template I chose TypeScript (Blank) npx expo install expo-router react-native-safe-area-context react-native-screens expo-linking expo-constants expo-status-bar react-native-gesture-handler mkdir app mv App.tsx app/index.tsx Change “main” entry in package.json to expo-router/entry Add a “scheme” to app.json Run the Expo go server using npx expo start

What I expected:

The App is running in the expo go app showing app/index.tsx

What happened instead:

An error screen saying: TypeError: Cannot read property 'useMemo' of null

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This is the full stack trace:

 ERROR  Warning: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:
1. You might have mismatching versions of React and the renderer (such as React DOM)
2. You might be breaking the Rules of Hooks
3. You might have more than one copy of React in the same app
See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem. 
    at ContextNavigator (http://192.168.178.26:8081/node_modules/expo-router/entry.bundle//&platform=android&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app:132996:24)
    at ExpoRoot (http://192.168.178.26:8081/node_modules/expo-router/entry.bundle//&platform=android&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app:132952:28)
    at App
    at ErrorToastContainer (http://192.168.178.26:8081/node_modules/expo-router/entry.bundle//&platform=android&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app:163392:24)
    at ErrorOverlay
    at withDevTools(ErrorOverlay) (http://192.168.178.26:8081/node_modules/expo-router/entry.bundle//&platform=android&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app:163142:27)
    at RCTView
    at View (http://192.168.178.26:8081/node_modules/expo-router/entry.bundle//&platform=android&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app:40237:43)
    at RCTView
    at View (http://192.168.178.26:8081/node_modules/expo-router/entry.bundle//&platform=android&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app:40237:43)
    at AppContainer (http://192.168.178.26:8081/node_modules/expo-router/entry.bundle//&platform=android&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app:40048:36)
    at main(RootComponent) (http://192.168.178.26:8081/node_modules/expo-router/entry.bundle//&platform=android&dev=true&hot=false&lazy=true&transform.engine=hermes&transform.bytecode=true&transform.routerRoot=app:124359:28)
 ERROR  TypeError: Cannot read property 'useMemo' of null

And:

This error is located at:
    in ContextNavigator (at ExpoRoot.js:64)
    in ExpoRoot (at qualified-entry.js:20)
    in App (created by ErrorOverlay)
    in ErrorToastContainer (created by ErrorOverlay)
    in ErrorOverlay (at withDevTools.js:18)
    in withDevTools(ErrorOverlay) (at renderApplication.js:57)
    in RCTView (at View.js:116)
    in View (at AppContainer.js:127)
    in RCTView (at View.js:116)
    in View (at AppContainer.js:155)
    in AppContainer (at renderApplication.js:50)
    in main(RootComponent) (at renderApplication.js:67), js engine: hermes
 ERROR  TypeError: Cannot read property 'useMemo' of null

Both traces are being printed twice. So the first part is printed twice and then the second part is printed twice.

Environment

expo-env-info 1.2.0 environment info: System: OS: macOS 14.4.1 Shell: 5.9 - /bin/zsh Binaries: Node: 20.12.2 - /usr/local/bin/node Yarn: 1.22.10 - /usr/local/bin/yarn npm: 10.5.2 - /usr/local/bin/npm Watchman: 2023.10.02.00 - /opt/homebrew/bin/watchman Managers: CocoaPods: 1.12.1 - /opt/homebrew/bin/pod SDKs: iOS SDK: Platforms: DriverKit 23.4, iOS 17.4, macOS 14.4, tvOS 17.4, visionOS 1.1, watchOS 10.4 IDEs: Xcode: 15.3/15E204a - /usr/bin/xcodebuild npmPackages: expo: ~50.0.14 => 50.0.17 expo-router: ~3.4.9 => 3.4.9 react: 18.2.0 => 18.2.0 react-native: 0.73.6 => 0.73.6 Expo Workflow: managed