The app crashes due to NullPointerException

[artyom-frolov]

Describe the bug
After integrating the AppsFlyer SDK into our Flutter app, some Android users experience crashes. No special actions are required from the user to reproduce the bug. This issue is similar to #322 but our app doesn't use deeplinks and has a different call stack.

Callstack:

Exception java.lang.NullPointerException:
  at com.appsflyer.appsflyersdk.AppsflyerSdkPlugin$5$1.run (AppsflyerSdkPlugin.java:384)
  at android.os.Handler.handleCallback (Handler.java:914)
  at android.os.Handler.dispatchMessage (Handler.java:100)
  at android.os.Looper.loop (Looper.java:224)
  at android.app.ActivityThread.main (ActivityThread.java:7551)
  at java.lang.reflect.Method.invoke
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:539)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:995)

To Reproduce
We cannot identify specific reproducible steps; the issue occurs unexpectedly.

Expected behavior
The app should work without crashes.

Screenshots
Callstack from Sentry:

Smartphone:

• Device: Redmi begonia (Redmi Note 8 Pro)
• OS: Android 11 (SDK 30)

Additional context
AppsFlyer SDK version: 6.13.2+1
Flutter version: 3.13.9 (stable)
Engine revision 0545f8705d
Dart version: 3.1.5
DevTools version: 2.25.0
IDE: VS Code (version 1.90.2)

[github-actions]

👋 Hi @artyom-frolov and Thank you for reaching out to us.
In order for us to provide optimal support, please submit a ticket to our support team at [email protected].
When submitting the ticket, please specify:

• ✅ your AppsFlyer sign-up (account) email
• ✅ app ID
• ✅ production steps
• ✅ logs
• ✅ code snippets
• ✅ and any additional relevant information.

[MahendraN35]

We are facing the same problem too and we are using appsflyer_sdk (6.14.3).

[RonyBrosh]

As a quick fix we reverted our AppsFlyer version update back to 6.13.0+1.
We never had those crashes with that version but keep in mind that deferred deep links won't work for you on iOS with that version of AppsFlyer. They will on Android though.

[artyom-frolov]

I conacted with support. Their response:
"I discussed this issue the mobile team and based on the error trace and shared code snippet It seems like we have an issue with the new startSDK method with onSuccess and onError callbacks here. As a workaround, we can suggest removing the callbacks on the Flutter side if they are not in use in your app logic and using startSDK without the callback."

I'll try this workaround. Maybe it will help someone too.

[wiktoriasobczyk]

Release of new package version should resolve this problem https://github.com/AppsFlyerSDK/appsflyer-flutter-plugin/releases/tag/v6.15.2