Epic recommended players not use the iOS 13 beta for Fortnite Mobile in a tweet Friday. The developer cited "stability concerns" as the reason for the warning.
Apple released iOS 13 beta on June 24 for public testing along with MacOS Catalina and iPadOS. Days after its release, Fortnite Mobile players experienced regular crashes with the beta installed on their iPhones.
As the case with any beta, there are good reasons to not install iOS 13 and wait for its official release. There's no set date on when the new iOS will come out, but it'll likely be when the iPhone 11 is released later this year.
Apple and Epic didn't immediately respond to requests for comment.