The massive demand for presale tickets for Taylor Swift’s latest concert tour crashed Ticketmaster on Tuesday. The company’s support account tweeted that fans “may be experiencing intermittent issues” and that it’s “urgently” working to resolve problems.

On Tuesday afternoon, Ticketmaster said that the presale has led to “historically unprecedented demand” for tickets with “millions” showing up to the presale. Despite the issues, the company says it has sold “hundreds of thousands” of tickets already, but when the sales are for the giant stadiums that Swift will be playing at, that may not be as impressive as it sounds. Ticketmaster will also be delaying the onsale times for the Los Angeles, Las Vegas, Santa Clara, and Seattle shows to 3PM PT. The Capital One presale, which had been scheduled for Tuesday, is being rescheduled to Wednesday.