2020-02-20 20:28:30,596 - octoprint - ERROR - Exception on / [GET]
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/views.py", line 423, in index
    response = default_view()
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/views.py", line 391, in default_view
    return preemptively_cached()
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/util/flask.py", line 985, in decorated_function
    return f(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/util/flask.py", line 1048, in decorated_function
    return f(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/util/flask.py", line 1056, in decorated_function
    r = f(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/util/flask.py", line 748, in decorated_function
    rv = f_with_duration(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/util/flask.py", line 717, in f_with_duration
    return f(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/util/flask.py", line 994, in decorated_function
    rv = f(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/util/flask.py", line 1013, in decorated_function
    rv = f(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/views.py", line 378, in make_default_ui
    r = make_response(render_template("index.jinja2", **render_kwargs))
  File "/usr/local/lib/python2.7/dist-packages/flask/templating.py", line 128, in render_template
    context, ctx.app)
  File "/usr/local/lib/python2.7/dist-packages/flask/templating.py", line 110, in _render
    rv = template.render(context)
  File "/usr/local/lib/python2.7/dist-packages/jinja2/environment.py", line 989, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/local/lib/python2.7/dist-packages/jinja2/environment.py", line 754, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/octoprint/.local/lib/python2.7/site-packages/octoprint/templates/index.jinja2", line 17, in top-level template code
    {% include 'initscript.jinja2' %}
  File "/home/octoprint/.local/lib/python2.7/site-packages/octoprint/templates/initscript.jinja2", line 39, in top-level template code
    var PERMISSIONS = {{ permissions|tojson }};
  File "/usr/local/lib/python2.7/dist-packages/flask/json.py", line 243, in tojson_filter
    return Markup(htmlsafe_dumps(obj, **kwargs))
  File "/usr/local/lib/python2.7/dist-packages/flask/json.py", line 186, in htmlsafe_dumps
    rv = dumps(obj, **kwargs) \
  File "/usr/local/lib/python2.7/dist-packages/flask/json.py", line 126, in dumps
    rv = _json.dumps(obj, **kwargs)
  File "/usr/lib/python2.7/json/__init__.py", line 251, in dumps
    sort_keys=sort_keys, **kw).encode(obj)
  File "/usr/lib/python2.7/json/encoder.py", line 209, in encode
    chunks = list(chunks)
  File "/usr/lib/python2.7/json/encoder.py", line 442, in _iterencode
    o = _default(o)
  File "/usr/local/lib/python2.7/dist-packages/octoprint/server/util/flask.py", line 1620, in default
    return flask.json.JSONEncoder.default(self, obj)
  File "/usr/local/lib/python2.7/dist-packages/flask/json.py", line 83, in default
    return _json.JSONEncoder.default(self, o)
  File "/usr/lib/python2.7/json/encoder.py", line 184, in default
    raise TypeError(repr(o) + " is not JSON serializable")
TypeError: Undefined is not JSON serializable
2020-02-20 20:28:30,599 - tornado.access - ERROR - 500 GET / (2a02:8108:1640: