An issue with Facebook had far-reaching consequences, taking down some of the biggest names in iOS apps.

Spotify, Pinterest, TikTok, Tinder and Call of Duty Mobile, along with many others, were all offline beginning Friday morning. The issue was tracked down to the Facebook iOS SDK that all of these apps rely on. The Facebook SDK helps integrate Facebook into an iOS app, and provides access to Facebook Analytics, Facebook Login, App Events, Graph API and sharing options.

Facebook’s developers acknowledged the SDK was the source of the problem, and worked to quickly fix it.

“We are aware and investigating an increase in errors on the iOS SDK which is causing some apps to crash.”

Later that morning, Facebook’s developers had identified and fixed the issue.

“Earlier today, a code change triggered crashes for some iOS apps using the Facebook SDK. We identified the issue quickly and resolved it. We apologize for any inconvenience.”