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App crash on launch due to FlutterBackendlessFCMService

Hi,
I have an issue with Backendless FCM SDK for Flutter.

If I built app in Release mode, it always crash on launch and this is in the log:




But if I built in Debug mode, app and SDK works fine. But it also got this in log on first open :

Have adjusted proguard config?
https://backendless.com/docs/flutter/setup.html#proguard-configuration

Thanks!, it works now.