在 Firebase Firestore 中询问数据时出现“Uncaught TypeError: can't convert undefined to object”错误

我有这个从 Firebase Firestore 获取数据的函数

function getEventData(eventNumber) {
    firebase.firestore().collection('events').document(eventNumber).get().then((doc) => {
        if(doc.exists){
            console.log("Document data:\n", doc.data());
        } else {
            console.log("Document doesn't exist.");
        }
    }).catch((error) => {
        console.error("Error: ", error);
    });
}

当我执行它时，我得到“Uncaught TypeError: can't convert undefined to object”作为错误