Niantic Support has informed users of the popular smartphone game Pokemon GO that they are aware of an issue with the recently released update on iOS. The software version 1.85.4 is causing some users to experience a crash once they open the app which is undoubtedly frustrating. The team says that this issue can be resolved by uninstalling and then reinstalling the app. Hopefully they are working on another patch this fix this issue.
Trainers that have upgraded to iOS version 1.85.4, we're aware of an issue that causes the Pokémon GO app to crash upon loading. If you are experiencing this issue, please try to reinstall the app.
— Niantic Support (@NianticHelp) August 25, 2018