Context Null check operator used on a null value

[mdmota]

I would like guidance on how to avoid this problem that occurs with some users. It's not a general error.
It seems that flutter disables/dispose the context during my app's initialization flow.
I'm using FutureBuilder in initState.
The screen only loads after the future method finishes calling several routines.
I initialize my Provider in initiState like this:

@override void initState() { super.initState(); WidgetsBinding.instance.addObserver(this); _userDataController = Provider.of<UserDataController>(context, listen: false); futureResult = getDataIni(); }

in my getDataIni method I initialize remote config settings, notifications, etc and call a method from my provider. In some devices it is giving this error when calling the provider method:
await _userDataController.loadData(context);

Error:
Null check operator used on a null value
#0 State.context (package:flutter/src/widgets/framework.dart:954)#1 _HomePageState.getDataIni.....)#2 _FutureBuilderState._subscribe. (package:flutter/src/widgets/async.dart:628)

I know it's a flutter error and not the provider. But how do I avoid this and guarantee state for the entire application?
My widget is a stateFullWidget.