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.