Various `NullPointerException`s in production with expo 49

Expo SDK
, ,
1
  1. SDK Version: 49
  2. Platform: Android

The problem

We are noticing our app crashing with NullPointerException occasionally in production. It seems to affect <1% of our users, but we are still seeing consistently a few times a day.

Our app uses the expo location and notification modules, and so far the stack traces always are calls to these modules.

Traces

location module:

java.lang.NullPointerException: java.lang.NullPointerException
    at expo.modules.kotlin.jni.JavaCallback.invoke(JavaCallback.kt)
    at expo.modules.kotlin.jni.JavaCallback.invoke(JavaCallback.kt:24)
    at expo.modules.kotlin.PromiseKt$toBridgePromise$resolveMethod$1.invoke(Promise.kt:22)
    at expo.modules.kotlin.PromiseKt$toBridgePromise$resolveMethod$1.invoke(Promise.kt:22)
    at expo.modules.kotlin.PromiseKt$toBridgePromise$1.resolve(Promise.kt:29)
    at expo.modules.adapters.react.PromiseWrapper.resolve(PromiseWrapper.java:27)
    at expo.modules.location.LocationHelpers$1.onLocationChanged(LocationHelpers.java:157)
    at expo.modules.location.LocationModule$1.onLocationResult(LocationModule.java:557)
    at com.google.android.gms.internal.location.zzaw.notifyListener(com.google.android.gms:play-services-location@@20.0.0:2)
    at com.google.android.gms.common.api.internal.ListenerHolder.zaa(com.google.android.gms:play-services-base@@18.1.0:2)
    at com.google.android.gms.common.api.internal.zacb.run
    at android.os.Handler.handleCallback(Handler.java:942)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:226)
    at android.os.Looper.loop(Looper.java:313)
    at android.os.HandlerThread.run(HandlerThread.java:67)

notifications module:

java.lang.NullPointerException: java.lang.NullPointerException
    at expo.modules.kotlin.jni.JavaCallback.invoke(JavaCallback.kt)
    at expo.modules.kotlin.jni.JavaCallback.invoke(JavaCallback.kt:24)
    at expo.modules.kotlin.jni.PromiseImpl.reject(PromiseImpl.kt:87)
    at expo.modules.kotlin.PromiseKt$toBridgePromise$1.reject(Promise.kt:41)
    at expo.modules.adapters.react.PromiseWrapper.reject(PromiseWrapper.java:36)
    at expo.modules.notifications.notifications.presentation.ExpoNotificationPresentationModule$4.onReceiveResult(ExpoNotificationPresentationModule.java:98)
    at android.os.ResultReceiver$MyResultReceiver.send(ResultReceiver.java:59)
    at android.os.ResultReceiver.send(ResultReceiver.java:93)
    at expo.modules.notifications.service.NotificationsService.handleIntent(NotificationsService.kt:650)
    at expo.modules.notifications.service.NotificationsService$onReceive$1.invoke(NotificationsService.kt:588)
    at expo.modules.notifications.service.NotificationsService$onReceive$1.invoke(NotificationsService.kt:586)
    at kotlin.concurrent.ThreadsKt$thread$thread$1.run(Thread.kt:30)

java.lang.NullPointerException: java.lang.NullPointerException
    at expo.modules.kotlin.jni.JavaCallback.invoke(JavaCallback.kt)
    at expo.modules.kotlin.jni.JavaCallback.invoke(JavaCallback.kt:24)
    at expo.modules.kotlin.jni.PromiseImpl.reject(PromiseImpl.kt:87)
    at expo.modules.kotlin.PromiseKt$toBridgePromise$1.reject(Promise.kt:41)
    at expo.modules.adapters.react.PromiseWrapper.reject(PromiseWrapper.java:36)
    at expo.modules.notifications.tokens.PushTokenModule$1.onComplete(PushTokenModule.java:72)
    at com.google.android.gms.tasks.zzi.run(com.google.android.gms:play-services-tasks@@18.0.2:1)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:226)
    at android.os.Looper.loop(Looper.java:313)
    at android.app.ActivityThread.main(ActivityThread.java:8855)
    at java.lang.reflect.Method.invoke(Method.java)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)

Other details

  • The error has happened on app launch and some time after the app is in use (this makes sense since we setup the expo-notification handler on startup but use expo-location later on)
  • Only seen on samsung phones so far
  • Seen on multiple android version (10, 11, 13)
  • Sentry does not seem to be able to provide any javascript stack trace when these crashes occur
  • We have found some expo issues that kind of look similar (#23382, #17426) but nothing that really seems to match up with our problem

We are having problems consistently reproducing the problem, but here is a repo with the minimum requirements to trigger the problem: GitHub - patidarsarvesh/ExpoNullPointerIssue.

If you have any tips on how we should proceed they would be very appreciated. We are having problems debugging since we don’t write any native code ourselves.

2

An update (since I’m not sure how to close this on discourse):

We discovered the crashes come from calling reloadAsync from expo-updates. We have opened an issue with a reproduction on the expo github repo.

3

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