Using LETTUCE_USE_TEST_DATABASE with django harvest management command causes error

[erfaan]

Django: 1.11
Lettuce: GitHub master

Here is the stack trace

  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 355, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/lettuce/django/management/commands/harvest.py", line 174, in handle
    self._testrunner.setup_test_environment()
  File "/usr/local/lib/python2.7/dist-packages/django/test/runner.py", line 463, in setup_test_environment
    setup_test_environment(debug=self.debug_mode)
  File "/usr/local/lib/python2.7/dist-packages/django/test/utils.py", line 122, in setup_test_environment
    "setup_test_environment() was already called and can't be called "
RuntimeError: setup_test_environment() was already called and can't be called again without first calling teardown_test_environment().