Three consecutive emails were sent to customers, some Saturday night and others Sunday morning, thanking them for purchasing Google Play, Mastercard, and Hotels.com gift cards, despite never having purchased them.

Due to an error in our system, an order confirmation email was sent to customers who did not purchase a gift card. In an email to CNBC, an Amazon spokesperson apologized for the inconvenience and informed the customers of the error.

There is no need for customers who received the false emails to take any further action.

Additionally, a paragraph in faulty Amazon emails warned users against gift card scams: “There are numerous scams in which fraudsters try to trick others into paying with well-known gift cards.” The messages left customers puzzled and alarmed that a hacker may have obtained access to their financial information and bought those gift cards.

Thank you, Amazon, for the early morning heart attack. Caffeine? ” one user wrote in a Facebook post after receiving the faulty emails.

One Amazon customer service representative on Sunday morning said the company received three calls in a row about the email issue. The automated customer service bot said that there were “longer than normal wait times” in the phone queue.

“I’m really sorry to all those customers who received this kind of email and that this caused them alarm. But rest assured that every account here is safe and in the meantime, we can just inform them to just disregard the message,” said another customer service representative Sunday morning.

One Reddit user said that an Amazon representative explained the mishap as “poorly worded emails intended to warn customers about potential scams.”