BENTONVILLE, ARKANSAS -- Walmart customers without cash or checks had a hard time shopping Thursday morning in Oklahoma and the rest of the nation.
The Bentonville, Arkansas-based retailer confirmed its system wasn't able run credit or debit cards for about 90 minutes Thursday morning.
In a news release on the company's corporate website, Walmart said 'while doing some required maintenance on our data system, we had a breaker fail on the back-up system, which disrupted our ability to process some credit and debit card transactions this morning.'
Walmart apologized saying they made changes to try and minimize the impact and had the system restored with an hour and a half.
The outage affects customers of Walmart and Sam's Club nationwide.