AttributeError: 'Group' object has no attribute 'team'

[forestgun]

Failed to create a issues from sentry to redmine (sentry = 5.1.5 , python = 2.6.6, Django = 1.4.3 )

Internal Server Error: /localhost9000/group/3412/actions/redmine/
Traceback (most recent call last):
File "/usr/local/lib/python2.6/dist-packages/Django-1.4.3-py2.6.egg/django/core/handlers/base.py", line 111, in get_response
response = callback(request, _callback_args, *_callback_kwargs)
File "/usr/local/lib/python2.6/dist-packages/sentry-5.1.5-py2.6.egg/sentry/web/decorators.py", line 154, in wrapped
return func(request, _args, *_kwargs)
File "/usr/local/lib/python2.6/dist-packages/sentry-5.1.5-py2.6.egg/sentry/web/decorators.py", line 65, in _wrapped
return func(request, project, _args, *_kwargs)
File "/usr/local/lib/python2.6/dist-packages/sentry-5.1.5-py2.6.egg/sentry/web/frontend/groups.py", line 355, in group_plugin_action
response = plugin.get_view_response(request, group)
File "/usr/local/lib/python2.6/dist-packages/sentry-5.1.5-py2.6.egg/sentry/plugins/base.py", line 321, in get_view_response
response = self.view(request, group)
File "/usr/local/lib/python2.6/dist-packages/sentry-5.1.5-py2.6.egg/sentry/plugins/bases/issue.py", line 156, in view
form = self.new_issue_form(request.POST or None, initial=self.get_initial_form_data(request, group, event))
File "/usr/local/lib/python2.6/dist-packages/sentry_redmine/plugin.py", line 89, in get_initial_form_data
'description': self._get_group_description(request, group, event),
File "/usr/local/lib/python2.6/dist-packages/sentry_redmine/plugin.py", line 69, in _get_group_description
'team_slug': group.team.slug,
AttributeError: 'Group' object has no attribute 'team'