Why is my bloc throwing an exception condition?

All hello, I have a screen, when opened, a request flies to the server, it returns 400 error status to me, but why does it not get into an error state, but gets into an exception, why?

I should hit when the status is not 200 in the block (status is OrderFinishError), but I hit throw StateError('err');

Here are my states -

    abstract class OrderFinishState {}
    
    class OrderFinishNotLoading extends OrderFinishState {}
    
    class OrderFinishLoading extends OrderFinishState {}
    
    class OrderFinishLoaded extends OrderFinishState {
      OrderFinishLoaded({required this.orderFinishModels});
      final OrderFinishModels orderFinishModels;
    }
    
    class OrderFinishError extends OrderFinishState {
      OrderFinishError({required this.errorModels});
      final ErrorModels errorModels;
    }

My сubit -

    class OrderFinishCubit extends Cubit<OrderFinishState> {
  OrderFinishCubit() : super(OrderFinishNotLoading());

  Future<void> orderFinish() async {
    emit(OrderFinishLoading());

    final prefs = await SharedPreferences.getInstance();
    final token = prefs.getString('token');

   final  orderId = prefs.getInt('orderId');

    final response = await http.post(Uri.parse(ConfigUrl.orderFinish),
        headers: {
          "Content-Type": "application/vnd.api+json",
          "Accept": "application/vnd.api+json",
          "Authorization": "Bearer $token",
        },
        body: jsonEncode(<String, dynamic>{
          "order_id": orderId,
        }));

    if (response.statusCode == 200) {
      log('test order finish cubit');
      log(orderId.toString());
      final responseJson = json.decode(response.body) as Map<String, dynamic>;
      log(json.decode(response.body).toString());
      emit(OrderFinishLoaded(
          orderFinishModels: OrderFinishModels.fromJson(responseJson)));
    } else {
      final jsonError = json.decode(response.body) as Map<String, dynamic>;
      log(response.statusCode.toString());
      log(json.decode(response.body).toString());
      emit(OrderFinishError(errorModels: ErrorModels.fromJson(jsonError)));
    }
  }
}

My BlocBuilder -

    return BlocProvider<OrderFinishCubit>(
            create: (context) => OrderFinishCubit()..orderFinish(),
            child: Scaffold(
              body: BlocBuilder<OrderFinishCubit, OrderFinishState>(
                builder: (context, state) {
                  if (state is OrderFinishNotLoading) {
                    return Center(
                      child:
                          Text('Дождитесь загрузки или перезапустите приложение'),
                    );
                  } else if (state is OrderFinishLoading) {
                    return const Center(
                      child: CircularProgressIndicator(),
                    );
                  } else if (state is OrderFinishLoaded) {
                    return Home();
                  } else if (state is OrderFinishError) {
                    Scaffold(
                        body: SafeArea(
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        crossAxisAlignment: CrossAxisAlignment.center,
                        children: [
                          Text(state.errorModels.message),
                          SizedBox(
                            height: 15,
                          ),
                          InkWell(
                              onTap: () async {
                                context.go('/activeTravel');
                              },
                              child: Container(
                                  decoration: BoxDecoration(
                                    borderRadius: BorderRadius.circular(32),
                                    color: ConfigColor.green,
                                  ),
                                  width: width,
                                  height: 44,
                                  child: Center(
                                    child: Text('На главную',
                                        textAlign: TextAlign.center,
                                        style: TextStyle(
                                            color: Colors.white,
                                            fontSize: 16,
                                            fontWeight: FontWeight.w500)),
                                  ))),
                        ],
                      ),
                    ));
                  }
                  throw StateError('err');
                },
              ),
            ));

Please note that I have a similar code, only on a different screen and it works well.

Please help me, this is the last task in the project))

It is because you are not returning the Scaffold widget.

Change

else if (state is OrderFinishError) {
                    Scaffold(
                        body: SafeArea(

to

else if (state is OrderFinishError) {
                   return  Scaffold(     // 👈 add return here
                        body: SafeArea(