can't add client via burp-ui

[2016-10-23 14:31:54,072] ERROR in app.log_exception: Exception on /api/settings/burp/config [PUT]
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/flask/app.py", line 1639, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib/python2.7/site-packages/flask/app.py", line 1625, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/lib/python2.7/site-packages/burpui/api/__init__.py", line 58, in decorated_view
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/flask_restplus/api.py", line 309, in wrapper
    resp = resource(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/flask/views.py", line 84, in view
    return self.dispatch_request(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/flask_restplus/resource.py", line 44, in dispatch_request
    resp = meth(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/burpui/api/__init__.py", line 97, in decorated
    return func(resource, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/burpui/api/settings.py", line 270, in put
    noti = bui.cli.store_conf_cli(ImmutableMultiDict(), newclient, None, server)
  File "/usr/lib/python2.7/site-packages/burpui/misc/backend/multi.py", line 80, in __call__
    return getattr(agent, self.method)(**encoded_args)
  File "/usr/lib/python2.7/site-packages/burpui/misc/backend/multi.py", line 497, in store_conf_cli
    bytes_pickles = pickles.encode(encoding='utf-8')
UnicodeDecodeError: 'utf8' codec can't decode byte 0x80 in position 0: invalid start byte

With python 2. I've tried to add client with name burp-client.