https://crash-stats.mozilla.com/crashes-per-day/?p=Thunderbird&v=45.6.0&v=56.0a1&v=56.0b1&v=56.0b2&hang_type=any&os=Windows&os=Mac+OS+X&os=Linux&date_start=2017-07-19&date_end=2017-08-11&submit=Generate returns "Internal Server Error" I tried several variations of releases and all failed, including https://crash-stats.mozilla.com/crashes-per-day/?p=Thunderbird&v=57.0a1&v=56.0a1&v=56.0b1&v=56.0b2&hang_type=any&os=Windows&os=Mac+OS+X&os=Linux&date_start=2017-08-01&date_end=2017-08-11&submit=Generate OTOH, this works, which is the query I started with, but then I started modifying the dates - https://crash-stats.mozilla.com/crashes-per-day/?p=Thunderbird&v=45.6.0&v=56.0b1&v=56.0a1&v=56.0b2&hang_type=any&os=Windows&os=Mac+OS+X&os=Linux&date_start=2017-04-19&date_end=2017-05-09&submit=Generate

All three of those urls work fine for me right now. However, I looked at Sentry for errors that occurred around the time you wrote up this report and I'm pretty sure it's this: """ KeyError: u'56.0b2' File "django/core/handlers/base.py", line 132, in get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File "newrelic/hooks/framework_django.py", line 499, in wrapper return wrapped(*args, **kwargs) File "crashstats/crashstats/decorators.py", line 101, in inner return view(request, *args, **kwargs) File "crashstats/crashstats/views.py", line 598, in crashes_per_day adi_groups = adi_by_version[term] """ I'm not sure why that would fail and then stop failing. Maybe it depends on data that didn't exist when it failed 4 hours ago?

indeed, the links now also work for me

This seems fine now so I'm going to mark it as WORKSFORME.