[Android] Crash: FileReaderModule.readAsText java.lang.NullPointerException

[JinYuSha0]

Description

I see a lot of these crashes in Google Crashlytics:

Fatal Exception: java.lang.NullPointerException
Attempt to invoke interface method 'java.lang.String com.facebook.react.bridge.ReadableMap.getString(java.lang.String)' on a null object reference
com.facebook.react.modules.blob.FileReaderModule.readAsText (FileReaderModule.java:53)
java.lang.reflect.Method.invoke (Method.java)
com.facebook.react.bridge.JavaMethodWrapper.invoke (JavaMethodWrapper.java:372)
com.facebook.react.bridge.JavaModuleWrapper.invoke (JavaModuleWrapper.java:188)
com.facebook.jni.NativeRunnable.run (NativeRunnable.java)
android.os.Handler.handleCallback (Handler.java:958)

android.os.Handler.dispatchMessage (Handler.java:99)
com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage (MessageQueueThreadHandler.java:27)
android.os.Looper.loopOnce (Looper.java:230)

android.os.Looper.loop (Looper.java:319)
com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run (MessageQueueThreadImpl.java:228)
java.lang.Thread.run (Thread.java:1012)

Locate the following code:
https://github.com/facebook/react-native/blob/main/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/blob/FileReaderModule.java#L47

The judgment of blob is not very good.

Steps to reproduce

 const fr = new FileReader();
 fr.readAsText({});

React Native Version

0.70.1

Affected Platforms

Runtime - Android

Output of npx react-native info

System:
    OS: Windows 10 10.0.19045
    CPU: (6) x64 Intel(R) Core(TM) i5-9400 CPU @ 2.90GHz
    Memory: 6.13 GB / 15.88 GB
  Binaries:
    Node: 20.13.1 - C:\Program Files\nodejs\node.EXE    
    Yarn: 1.22.22 - C:\Program Files\nodejs\yarn.CMD    
    npm: 10.5.2 - C:\Program Files\nodejs\npm.CMD       
    Watchman: Not Found
  SDKs:
    Android SDK: Not Found
    Windows SDK:
      AllowDevelopmentWithoutDevLicense: Enabled
      AllowAllTrustedApps: Enabled
  IDEs:
    Android Studio: AI-233.14808.21.2331.11709847
    Visual Studio: Not Found
  Languages:
    Java: 17.0.11 - C:\Program Files\Microsoft\jdk-17.0.11.9-hotspot\bin\javac.EXE
  npmPackages:
    @react-native-community/cli: Not Found
    react: 18.1.0 => 18.1.0
    react-native: 0.70.14 => 0.70.14
    react-native-windows: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Stacktrace or Logs

Fatal Exception: java.lang.NullPointerException
Attempt to invoke interface method 'java.lang.String com.facebook.react.bridge.ReadableMap.getString(java.lang.String)' on a null object reference
com.facebook.react.modules.blob.FileReaderModule.readAsText (FileReaderModule.java:53)
java.lang.reflect.Method.invoke (Method.java)
com.facebook.react.bridge.JavaMethodWrapper.invoke (JavaMethodWrapper.java:372)
com.facebook.react.bridge.JavaModuleWrapper.invoke (JavaModuleWrapper.java:188)
com.facebook.jni.NativeRunnable.run (NativeRunnable.java)
android.os.Handler.handleCallback (Handler.java:958)

android.os.Handler.dispatchMessage (Handler.java:99)
com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage (MessageQueueThreadHandler.java:27)
android.os.Looper.loopOnce (Looper.java:230)

android.os.Looper.loop (Looper.java:319)
com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run (MessageQueueThreadImpl.java:228)
java.lang.Thread.run (Thread.java:1012)

Reproducer

https://github.com/JinYuSha0/FileReaderReproducer

Screenshots and Videos

No response

[github-actions]

⚠️

Unsupported Version of React Native

ℹ️

It looks like your issue or the example you provided uses an unsupported version of React Native. Due to the number of issues we receive, we're currently only accepting new issues against one of the supported versions. Please upgrade to latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If you cannot upgrade, please open your issue on StackOverflow to get further community support.

[cortinico]

Yup that's a valid bugreport 👍 Thanks for the reproducer @JinYuSha0 A fix is forthcoming