Salt Lake City – The makers of the popular “Fortnite” video game say their game’s login system contained a flaw that allowed hackers to impersonate real gamers and use their credit card info to purchase in-game currency.

The hackers would then transfer the purchases from the hacked accounts into their own personal accounts.

It’s still unclear how many Fortnite users were affected, but more than 80 million people worldwide have accounts.

Epic Games, the company that owns Fortnite, is encouraging players to protect their account by not re-using passwords and using strong passwords.

They also say you should never share account information with other people.