Many FirstBank VI customers woke Tuesday morning to find their account balances at zero due to a glitch the bank later described as an “operational issue.”

Though officials were silent for much of the day as customers complained on social media that they couldn’t access information on their money, the bank emailed a mass apology on Tuesday evening.

“We would like to inform you that we are facing an operational issue that may be temporarily impacting your account, showing incorrect balances that do not match your actual balance,” the email stated. “Our team is working diligently to rectify this operational error as soon as possible so that the correct balance is reflected.”

The bank claimed that nearly all balance information should have been back to normal by that time.

“However, if your account does not reflect its actual balance yet, rest assured that it will be corrected in the next few hours,” the statement added. “It is important to note that all our customers’ balances are safe.”

FirstBank did not respond to a request for comment.