Error while branch batch removal

remote: Traceback (most recent call last):
remote:   File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
remote:     response = wrapped_callback(request, *callback_args, **callback_kwargs)
remote:   File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/newrelic/hooks/framework_django.py", line 527, in wrapper
remote:     return wrapped(*args, **kwargs)
remote:   File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
remote:     return view_func(*args, **kwargs)
remote:   File "/opt/python/domains/bitbucket.org/current/bitbucket/apps/httphooks/views.py", line 39, in inner
remote:     content = func(request, environ=environ)
remote:   File "/opt/python/domains/bitbucket.org/current/bitbucket/apps/httphooks/views.py", line 56, in postgithook
remote:     return posthooks.githooks(request, environ)
remote:   File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/orochi/git.py", line 1859, in wrapper
remote:     push = GitPush.fromfile(repo, input_ or sys.stdin)
remote:   File "/opt/python/domains/bitbucket.org/current/bitbucket/local/env/lib/python2.7/site-packages/orochi/git.py", line 1953, in fromfile
remote:     for ref in repo._repo.listall_reference_objects():
remote: OSError: failed to read descriptor: Stale file handle