Several popular apps including Spotify, Waze, Pinterest, and Tinder kept crashing Friday morning on iPhones, and it appears an issue with Facebook was to blame.
Social media users flooded Twitter with complaints that the Spotify iPhone app would immediately crash when it was opened. The problems did not impact Android users and Spotify was working fine on computers.
Around 9 a.m. Eastern, the issue appeared to be fixed and apps were working normally again. Spotify tweeted that everything is "now back in tune!"
The same issues had been reported with Pinterest, Tinder, Waze, and many other apps.
The issues appeared to be stemming from Facebook's iOS software developer kit, or SDK, which is embedded directly in many apps.
Facebook acknowledged on its developer platform early Friday morning that a software bug was causing a sudden spike in iPhone app crashes. Later on in the morning, the company said the issue had been resolved.
According to The Verge, this isn't the first time Facebook's SDK has caused widespread issues like this on phone apps. A near-identical issue happened back in May and impacted dozens of services.