RangeError (index): Invalid value: Not in inclusive range 0..2 3 – Flutter

I built a simple quiz app with 3 questions, the logic works and it takes you through all the questions. At the end there is an alert dialog that pops up and shows you your score, after clicking close it resets the quiz and allows you to play again.

I am now getting an error when the alert dialog pops up that says

RangeError (index): Invalid value: Not in inclusive range 0..2 3

Please help with this.

Here is my code for the app

import 'package:flutter/material.dart';

void main() => runApp(const QuizApp());

class QuizApp extends StatelessWidget {
  const QuizApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Quiz Game',
      home: QuizPage(),
    );
  }
}

class QuizPage extends StatefulWidget {
  const QuizPage({super.key});

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

class _QuizPageState extends State<QuizPage> {
  int _currentQuestion = 0;
  int _score = 0;

  final List<Map<String, Object>> _questions = [
    {
      'question': 'What is the capital of France?',
      'answers': [
        {'text': 'Paris', 'correct': true},
        {'text': 'London', 'correct': false},
        {'text': 'Berlin', 'correct': false},
      ],
    },
    {
      'question': 'Is this app useful?',
      'answers': [
        {'text': 'Yes', 'correct': true},
        {'text': 'No', 'correct': false},
      ],
    },
    {
      'question': 'Is this app fun?',
      'answers': [
        {'text': 'Yes', 'correct': true},
        {'text': 'No', 'correct': false},
        {'text': 'Maybe', 'correct': false},
      ],
    },
  ];

  @override
  Widget build(BuildContext context) {
    // Get the current question and answers
    final Map<String, Object> currentQuestion = _questions[_currentQuestion];
    final String question = currentQuestion['question'] as String;
    final List<Map<String, Object>> answers =
        currentQuestion['answers'] as List<Map<String, Object>>;

    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            // Display the current question
            Text(
              question,
              style: Theme.of(context).textTheme.headline3,
            ),
            const SizedBox(height: 20),

            // Display the answer buttons
            ...answers.map((Map<String, Object> answer) {
              return TextButton(
                child: Text(answer['text'] as String),
                onPressed: () => _answerQuestion(answer['correct'] as bool),
              );
            }),
          ],
        ),
      ),
    );
  }

  void _answerQuestion(bool isCorrect) {
    if (isCorrect) {
      _score++;
    }

    setState(() {
      _currentQuestion++;

      // Check if we have reached the end of the quiz
      if (_currentQuestion >= _questions.length) {
        // Show a dialog with the final score
        showDialog(
          context: context,
          builder: (BuildContext context) {
            return AlertDialog(
              title: const Text('Quiz Finished'),
              content: Text('You scored $_score points'),
              actions: [
                TextButton(
                  child: const Text('Close'),
                  onPressed: () {
                    // Reset the quiz
                    setState(() {
                      _currentQuestion = 0;
                      _score = 0;
                    });
                    Navigator.of(context).pop();
                  },
                ),
              ],
            );
          },
        );
      }
    });
  }
}