How to get value from an object which in the state (flutter_bloc)

in builder method I reach the value of state like

return BlocBuilder<UsersOwnProfileBloc, UsersOwnProfileState>(
   cubit: widget.bloc,
   builder: (context, state) {
      if (state is FetchedUserSettingState) {
      bool account = state.userSettings.publicAccount
}

But I need to get the values from initState. I need to set the values of the widget. I tried something like this but I got error

 @override
  void initState() {
    super.initState();
     UsersOwnProfileState state = BlocProvider.of<UsersOwnProfileBloc>(context).state;
     if (state is FetchedUserSettingState) {
       publicAccount = state.userSettings.publicAccount;
     }
} 

Can anyone show me how to get state value in initState?

class UserSettingPage extends StatefulWidget {
  final UsersOwnProfileBloc bloc;

  const UserSettingPage({Key key, this.bloc}) : super(key: key);

  @override
  _UserSettingPageState createState() => _UserSettingPageState();
}

class _UserSettingPageState extends State<UserSettingPage> {
  bool newListingAlert;
  bool listingForSearchAlert;
  bool searchForListingAlert;
  bool followAlert;
  bool publicAccount;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      final state = BlocProvider.of<UsersOwnProfileBloc>(context).state;
      if (state is FetchedUserSettingState) {
        publicAccount = state.userSettings.publicAccount;
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<UsersOwnProfileBloc, UsersOwnProfileState>(
      cubit: widget.bloc,
      builder: (context, state) {
        if (state is FetchedUserSettingState) {
          return Scaffold(
            appBar: PreferredSize(
              preferredSize: Size.fromHeight(25.h),
              child: ListingEditAppBar(
                onCancel: () {
                  widget.bloc.add(FetchUserEvent(userId: CurrentUser.currentUser.id));
                  Navigator.pop(context);
                },
              ),
            ),
            body: Column(
              children: [
                PageTitle(title: "Preferences"),
                Expanded(
                  child: ListView(
                    children: [
                      Padding(
                        padding: const EdgeInsets.all(8.0),
                        child: Row(
                          mainAxisAlignment: MainAxisAlignment.spaceBetween,
                          crossAxisAlignment: CrossAxisAlignment.center,
                          children: [
                            Text("Profilim herkese açık"),
                            Switch(
                              onChanged: (value) {
                                setState(() {
                                  publicAccount = value;
                                });
                              },
                              value: publicAccount,
                            )
                          ],
                        ),
                      )
                    ],
                  ),
                )
              ],
            ),
          );
        }
        return MyProgressIndicator();
      },
    );
  }
}

I have added the whole code. I am getting the following error.

Failed assertion: boolean expression must not be null The relevant error-causing widget was Switch