We hit a bunch of these after shipping to the Beta channel: https://errormill.mozilla.org/Releng/balrog-prod/group/172432/ There's two main causes: 1) People putting random things as a locale, eg: "en-USmr" 2) Locales that we shipped at one time, but don't anymore. Eg: "mn". KeyError: u'mn' Stacktrace (most recent call last): File "flask/app.py", line 1060, in full_dispatch_request rv = self.dispatch_request() File "flask/app.py", line 1047, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args) File "flask/views.py", line 56, in view return self.dispatch_request(*args, **kwargs) File "flask/views.py", line 112, in dispatch_request return meth(*args, **kwargs) File "auslib/web/views/client.py", line 38, in get xml = release.createXML(query, update_type, app.config["WHITELISTED_DOMAINS"], app.config["SPECIAL_FORCE_HOSTS"]) File "auslib/blob.py", line 222, in createXML localeData = self.getPlatformData(buildTarget)["locales"][locale]

I expect to deal with this as part of bug 1069454.

This is definitely getting addressed in bug 1069454.