FlutterErrorDetail return null on release mode - flutter

Question

I'm using this code to catch errors in my flutter application and it works perfectly in debug mode but in release mode FlutterErrorDetails is null and I cant see what caused the error.
how can I fix this?
This is the code that I use:
runZonedGuarded(() {
WidgetsFlutterBinding.ensureInitialized();
FlutterError.onError = (FlutterErrorDetails details) {
if(MyApp.bugSentTime.isBefore(DateTime.now().add(Duration(seconds: -10)))){
MyApp.sendBug(details);
MyApp.bugSentTime = DateTime.now();
}
};
runApp(MyApp());
}, (error, stackTrace) {
if(MyApp.bugSentTime.isBefore(DateTime.now().add(Duration(seconds: -10)))){
FlutterErrorDetails details = FlutterErrorDetails(exception: error, stack: stackTrace);
MyApp.sendBug(details);
MyApp.bugSentTime = DateTime.now();
}
FirebaseCrashlytics.instance.recordError(error, stackTrace);
});
And these are my results, first one is from release and the second one from debug mode
Wed Dec 30 2020 17:00:40 GMT+0100 (Central European Standard Time) {
mode: 'release',
os: 'android',
model: 'SM-N770F',
brand: 'samsung',
osVersion: '29',
buildNumber: '1',
buildVersion: '1.0.0',
username: 'Emad',
error: ''
}
Tue Dec 29 2020 01:47:40 GMT+0100 (Central European Standard Time) {
mode: 'debug',
os: 'android',
model: 'SM-N770F',
brand: 'samsung',
osVersion: '29',
buildNumber: '1',
buildVersion: '1.0.0',
username: 'Emad',
error: '══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE ╞═════════════════\n' +
'The following assertion was thrown resolving an image codec:\n' +
'Unable to load asset: assets/images/1.png\n' +
'When the exception was thrown, this was the stack:\n' +
.....
}

Answer 1

Probably FlutterErrorDetails is not actually null, and you can get the info you want using other properties of the details object.
I had a similar experience. I found that the FlutterErrorDetails was not null. It was details.toString() that was the problem. It behaves differently in release mode and defaults to blank output. (sigh)
(I bet your sendBug(details) uses .toString() explicitly or implicitly.)
In my case, the detail.exception and details.stack properties were available and populated. I was able to get good error logging in release mode by using them.