iOS Application crash when await FlutterDownloader.initialize() and tab change or screen navigate to other screen

My application crashes when i change tab of my download screen as quickly as it appear. First i thought it was due to some API calls but i have 8 tabs and none of these crashes my application even if i change them quickly. There was another issue but that wasn't solution to my problem

these are lines i use to initialized downloader

WidgetsFlutterBinding.ensureInitialized();
await FlutterDownloader.initialize();
FlutterDownloader.registerCallback(downloadCallback);
it works fine on android