Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

Description

Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

Steps to reproduce

yarn ios

React Native Version

0.83.1

Affected Platforms

Runtime - iOS

Output of npx @react-native-community/cli info

info Fetching system and libraries information...
System:
  OS: macOS 15.6
  CPU: (8) x64 Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
  Memory: 1.01 GB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.19.4
    path: /usr/local/opt/node@20/bin/node
  Yarn:
    version: 4.9.1
    path: /usr/local/opt/node@20/bin/yarn
  npm:
    version: 10.8.2
    path: /usr/local/opt/node@20/bin/npm
  Watchman:
    version: 2025.09.01.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /Users/yousyoeun/.rbenv/shims/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.0
      - iOS 26.0
      - macOS 26.0
      - tvOS 26.0
      - visionOS 26.0
      - watchOS 26.0
  Android SDK: Not Found
IDEs:
  Android Studio: 2025.2 AI-252.27397.103.2522.14617522
  Xcode:
    version: 26.0.1/17A400
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.15
    path: /usr/bin/javac
  Ruby:
    version: 3.2.2
    path: /Users/yousyoeun/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.2.0
    wanted: 19.2.0
  react-native:
    installed: 0.83.1
    wanted: 0.83.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

MANDATORY Reproducer

j

Screenshots and Videos

Le rapport ne mentionne aucun fichier source, test ou reproducteur exploitable au-delà de yarn ios ; commencez par le reproduire avec React Native 0.83.1 sur iOS et capturez la trace de pile native complète. Le travail est considéré comme terminé lorsque le crash nil est isolé et corrigé avec une vérification de régression, mais l’issue n’identifie pas où cette vérification doit être placée.