iPhone users across the world were left frustrated after major apps such as Spotify, Waze and Call of Duty on mobile repeatedly crashed as a result of a Facebook developer glitch.
The Facebook Developer team said online there had been a "sudden spike in crashes" arising apps connected to the Facebook iOS software development kit.
"We are aware and investigating an increase in errors on the iOS SDK which is causing some apps to crash," the major social media company confirmed online late on Friday night.
Android phone users do not appear to have been affected.
Messenger app Viber said its app, alongside thousands of others, was down due to technical problems which would be fixed soon.
Gaming platform PUBG said it was also affected by the crash, and was "actively working with related platforms and support to solve the problem", while Call of Duty and Mario Kart Tour also acknowledged their apps could not be opened.
As word of the bug spread across social media, aggrieved Apple users took to Twitter to vent their outrage.