The retailer confirmed via its Twitter account that it had identified a checkout issue at “select stores,” adding the issue wasn’t related to security. The checkout problems, which were lamented by shoppers in various tweets, comes roughly six months after a massive data breach that kept shoppers away during the crucial holiday season. Target (TGT) has sought to distance itself from that incident, which led to the resignation of Chief Executive Gregg Steinhafel earlier this year.

After confirming the checkout issue, Target in a subsequent tweet said the issue had been resolved.

“Thanks for your patience,” Target said. “Once again, we sincerely apologize.” A Target representative wasn’t immediately available to comment on how many stores were affected and what caused the issue at its checkout system.

Target’s performance at home has been mixed in recent quarters, including a decline in the fourth quarter last year due to the data breach. The company is also striving to bolster its new Canada division, a division that remains unprofitable.