NEW YORK — PublX Corp. said it plans to stop selling digital coupons for more than 20 months, including one that included a $20 coupon that offered to pay $10 for a $1 drink at an upscale New York restaurant.

The coupon expired on Tuesday and no one had yet received the offer, which is available only through the online store.

PublX spokeswoman Christine Schoen told The Associated Press on Wednesday that the company is “working closely” with the Consumer Products Safety Commission and the National Instant Criminal Background Check System (NICS), which will conduct a review.

“The new coupon is no longer available through Publx,” she said.

“We have a complete, comprehensive safety program in place to protect consumers and are taking steps to ensure it will continue to be available.”

Schoen did not immediately respond to a request for comment from ABC News.

PubLix, which sells more than 2 million digital coupons each month, said the decision will affect 1.4 million customers who used the coupon or bought another digital coupon at the time of its expiration.

The company said in a statement that it is working with the company to “address the issue in a timely manner.”

Publix said that it will offer a digital coupon for the same amount at an online store starting Aug. 31, 2018, and will continue offering digital coupons until that time.

It also said that customers can use their existing digital coupons on other retailers, such as Walgreens.

In addition, it will change how coupons are processed at some of its stores, starting in 2018.