Yesterday, September 7, for approximately five hours, the Wikipedia app for Android crashed on startup (or navigation to the feed activity) for all users of the current version of the app with an app language other than English. The proximate cause was a change in how feed content responses are composed in RESTBase. Both the beta and stable versions of the app were affected. A full incident report is available here: https://wikitech.wikimedia.org/wiki/Incident_documentation/20160907-Android The team regrets the error and apologizes to all affected users.