null_pointer_exception.js

let questions = null;
async function getQuestion() {
  questions = await getQuestions()
  return questions[Math.random() * questions.length - 1]
}

function answerQuestion(question, answer) {
    questions.find((currentQuestion) => currentQuestion.question === question.question)
    //     ^^^^^^^
    // if answer question is called before getQuestion is called you'll run into
    // a null pointer exception (Cannot call find of null)
}

answerQuestion({ question: "some question", a: '...' }, 'a')
// answer question will be called before getQuestion for whatever reason
// an exception will be thrown as questions is null