A payment card breach has hit the American hotel chain Omni Hotels & Resorts.

Detected on May 30, 2016, the breach impacted more than 50,000 credit and debit cards at 49 locations. The breach is believed to have been in operation between December 23, 2015 and June 14, 2016. Customers were not notified of the breach until the issue was resolved.

Omni Hotels & Resorts said in a statement: “Upon learning of the intrusion, we promptly engaged leading IT investigation and security firms approved by the major credit card companies to determine the facts and contain the intrusion. The issue has been resolved, and we have taken steps to further strengthen our systems. We have contacted law enforcement and are cooperating with its investigation.”

Details affected include:

Credit and debit card numbers

Cardholder names

Security codes

Expiration dates

It only affects those who used their cards at one of the affected locations and not via the online booking platform. However, if you did use your card at an affected location, there’s no guarantee that your details were stolen.

The statement from Omni Hotels & Resorts added: “Even if you used your payment card at one of the properties involved, it does not mean you will be affected by this issue. Out of an abundance of caution, you may want to review and monitor your payment card statements if you used a payment card at an Omni hotel during the above referenced dates.”