flutter_bloc (emit was called after an event handler completed normally

So, I was working with Django rest framework creating my APIs and all. And i wanted to check if I can get the response from the backend. So, I was able to get the response. But I saw some issues on the debug console. Please help me figure out the problem. This is what I received on the Debug Console.

Restarted application in 1,314ms.
I/flutter ( 1751): {"token":"0d15f2d45f11869174395d623c066080bd2ade52"}
E/flutter ( 1751): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: 'package:bloc/src/bloc.dart': Failed assertion: line 232 pos 7: '!_isCompleted':
E/flutter ( 1751):
E/flutter ( 1751):
E/flutter ( 1751): emit was called after an event handler completed normally.
E/flutter ( 1751): This is usually due to an unawaited future in an event handler.
E/flutter ( 1751): Please make sure to await all asynchronous operations with event handlers
E/flutter ( 1751): and use emit.isDone after asynchronous operations before calling emit() to
E/flutter ( 1751): ensure the event handler has not completed.
E/flutter ( 1751):
E/flutter ( 1751):   **BAD**
E/flutter ( 1751):   on<Event>((event, emit) {
E/flutter ( 1751):     future.whenComplete(() => emit(...));
E/flutter ( 1751):   });
E/flutter ( 1751):
E/flutter ( 1751):   **GOOD**
E/flutter ( 1751):   on<Event>((event, emit) async {
E/flutter ( 1751):     await future.whenComplete(() => emit(...));
E/flutter ( 1751):   });
E/flutter ( 1751):
E/flutter ( 1751): #0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:46:39)
E/flutter ( 1751): #1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:36:5)
E/flutter ( 1751): #2      _Emitter.call
E/flutter ( 1751): #3      new LoginFormBloc.<anonymous closure>.<anonymous closure>
E/flutter ( 1751): <asynchronous suspension>
E/flutter ( 1751):
Reloaded 1 of 746 libraries in 1,055ms.

Here's my source code:

class LoginFormBloc extends Bloc<LoginFormEvent, LoginFormState> {
  LoginFormBloc(this._getAuthInfo) : super(LoginFormState.initial()) {
    on<LoginFormEvent>(
      (event, emit) {
        event.map(
          emailChanged: (e) {
            emit(
              state.copyWith(
                emailAddress: EmailAddress(e.emailStr),
                authFailureOrSuccessOption: none(),
              ),
            );
          },
          passwordChanged: (e) {
            emit(
              state.copyWith(
                password: Password(e.passwordStr),
                authFailureOrSuccessOption: none(),
              ),
            );
          },
          loggedIn: (e) async {
            final isEmailValid = state.emailAddress.value.isRight();
            final isPasswordValid = state.password.value.isRight();

            Either<AuthFailure, TokenValue>? loginFailureOrSuccess;

            if (isEmailValid && isPasswordValid) {
              emit(
                state.copyWith(
                  isSubmitting: true,
                  authFailureOrSuccessOption: none(),
                ),
              );
              loginFailureOrSuccess = await _getAuthInfo(
                Params(
                  emailAddress: state.emailAddress,
                  password: state.password,
                ),
              );
            }
            emit(
              state.copyWith(
                isSubmitting: false,
                showErrorMessages: true,
                authFailureOrSuccessOption: optionOf(loginFailureOrSuccess),
              ),
            );
          },
        );
      },
    );
  }
  final GetAuthToken _getAuthInfo;
}

The error is pointed on 2nd emit inside loggedIn event handler.