AssertionError: Cannot filter a query once a slice has been taken.

[mbeacom]

View details in Rollbar: https://rollbar.com/gitcoin/gitcoin/items/732/

Traceback (most recent call last):
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/rest_framework/viewsets.py", line 90, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/rest_framework/views.py", line 489, in dispatch
    response = self.handle_exception(exc)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/rest_framework/views.py", line 449, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/rest_framework/views.py", line 486, in dispatch
    response = handler(request, *args, **kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/rest_framework/mixins.py", line 56, in retrieve
    instance = self.get_object()
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/rest_framework/generics.py", line 98, in get_object
    obj = get_object_or_404(queryset, **filter_kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/rest_framework/generics.py", line 21, in get_object_or_404
    return _get_object_or_404(queryset, *filter_args, **filter_kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/django/shortcuts.py", line 87, in get_object_or_404
    return queryset.get(*args, **kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/django/db/models/query.py", line 394, in get
    clone = self.filter(*args, **kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/django/db/models/query.py", line 836, in filter
    return self._filter_or_exclude(False, *args, **kwargs)
  File "/home/ubuntu/gitcoin/gitcoin-3/lib/python3.6/site-packages/django/db/models/query.py", line 848, in _filter_or_exclude
    "Cannot filter a query once a slice has been taken."
AssertionError: Cannot filter a query once a slice has been taken.