How to stop the script if the data from Mongoose came empty?

Question

Mongoose

Good day!
Let me get straight to the question:
This script in the photo receives transactions from the database, and if they exist, it returns an error.
However, the work of the entire script does not stop. How can I make sure that the script below this interaction does not work?
I don't need to do any further work if there is an error. In my case, it will return an error and continue to execute the script. (headers error appears)

Answer 1

Решил проблему следующим методом:
(async () => {
    const transaction = await GameController.isTransactionCompleted(req.body.transaction_id);

   if (transaction.length !== 0) return bla-bla-bla
});

async isTransactionCreated(transaction_id) => {
    let total_transactions;
    await GameModel.find({ transaction_id: transaction_id }, (error, transaction) => {Ваши извращения из Pomise можно записать в total_transactions и вернуть его же});
};

Answer 2

if ... else?

if (!data) {
  // ничего нет
} else {
  // всё есть
}