One of the world’s largest festivals has had its data hacked with over 64,000 festival-goers’ personal information stolen.

Tomorrowland, the world-renowned electronic dance music festival held in Boom, Belgium, has had its old online server hacked. The system’s security was compromised to steal names, emails, ages, postcodes and genders of from 64,000 of 2014’s 360,000 attendees. 

Data not taken includes payment details, passwords, and addresses. However with names and postcodes stolen, it should be considered a ‘sensitive data’ breach.

While the affected systems were reportedly shut down and taken offline, a spokesperson told Belgian newspaper De Standaard that past attendees should be “vigilant” when receiving e-mails about Tomorrowland ticket sales and promotions.

Spokesperson Debby Wilmsen told De Standaard:

“The managers of the Paylogic ticketing system noticed some unusual activity on an older system. After careful analysis it appeared that an old database from Tomorrowland 2014 was concerned. The server in question was immediately taken offline.

“We ask to be vigilant when receiving e-mails about ticket sales, promotions or other addressees that do not come from official Paylogic or Tomorrowland communication channels,” Wilmsen added. “All communication from Tomorrowland is led by tomorrowland.com. Links to Tomorrowland ticket sales can only be found via my.tomorrowland.com or official travel partners.”