I hit this traceback when I clicked "Pay" twice in the PayPal lightbox. I will add STR when I figure it out traceback: Traceback (most recent call last): File "/data/www/addons-dev.allizom.org/zamboni/vendor/src/django/django/core/handlers/base.py", line 111, in get_response response = callback(request, *callback_args, **callback_kwargs) File "/data/www/addons-dev.allizom.org/zamboni/apps/amo/decorators.py", line 28, in wrapper return func(request, *args, **kw) File "/data/www/addons-dev.allizom.org/zamboni/apps/addons/decorators.py", line 30, in wrapper return f(request, addon, *args, **kw) File "/data/www/addons-dev.allizom.org/zamboni/apps/addons/decorators.py", line 55, in wrapper return f(request, addon, *args, **kw) File "/data/www/addons-dev.allizom.org/zamboni/apps/amo/decorators.py", line 102, in wrapper return f(*args, **kw) File "/data/www/addons-dev.allizom.org/zamboni/apps/amo/decorators.py", line 94, in wrapper return f(*args, **kw) File "/data/www/addons-dev.allizom.org/zamboni/apps/addons/views.py", line 539, in purchase_complete con = Contribution.objects.get(uuid=uuid_, type=amo.CONTRIB_PENDING) File "/data/www/addons-dev.allizom.org/zamboni/vendor/src/django/django/db/models/manager.py", line 132, in get return self.get_query_set().get(*args, **kwargs) File "/data/www/addons-dev.allizom.org/zamboni/vendor/src/django/django/db/models/query.py", line 349, in get % self.model._meta.object_name) DoesNotExist: Contribution matching query does not exist.