I would bet that all iOS fans that use the Facebook app has had the app randomly crash on them. Facebook has known about a bug in the iOS version of its app for a long time, but the bug proved difficult to squash. The bug was in the Apple Core Data system and finally engineers have fixed the issue.
With the bug addressed, they say that the iOS version of the Facebook app has reduced its crash rate by more than 50%. The team needed months to create the correct approach for the crash issue and it involved multiple steps.
After coming to the correct path to fix the error, the engineering team worked with the networking team and had the issue repaired in a few hours. Facebook engineers Slobodan Predolac and Nicholas Spiegelberg said, "Dealing with a large, rapidly evolving codebase can seem overwhelming at times. Everyday tasks like analyzing crashes and understanding code can turn into their own programming challenges. At these moments, it's important to work together, brainstorm, and rely on computer programming fundamentals."