I want to write a function which is checking if a specific value is in the firebase database and then do something when it is and do something else when it isn't. But I'm getting a Uncaught TypeError: db._checkNotDeleted is not a function error. I don't know why.

js:

    const onBuyHandler = (event) => {
    const db = getDatabase();
    ref(`users/${user.uid}/items/kitchen/${props.item.name}`).once(
        'value',
        (snapshot) => {
            if (snapshot.exists()) {
            } else {
                set(
                    ref(
                        db,
                        `users/${user.uid}/items/kitchen/${props.item.name}`
                    ),
                    {
                        name: props.item.name,
                        amount: 1,
                    }
                );
            }
        }
    );
};