Error on sandbox page for docker names using multiple words

I found a bug for endpoints of /apps/(?P<docker_name>[\\w-]+)$/sandbox. This bug shows up only when docker names are using multiple words such as my new app or hello world.

Here the error reported

NoReverseMatch at /apps/hello-world/sandbox

Reverse for 'webapp_detail' with arguments '('Hello world',)' not found. 1 pattern(s) tried: ['apps/(?P<docker_name>[\\w-]+)$']

And its traceback:

Traceback:

File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py" in _get_response
  217.                 response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py" in _get_response
  215.                 response = response.render()

File "/usr/local/lib/python3.5/dist-packages/django/template/response.py" in render
  107.             self.content = self.rendered_content

File "/usr/local/lib/python3.5/dist-packages/django/template/response.py" in rendered_content
  84.         content = template.render(context, self._request)

File "/usr/local/lib/python3.5/dist-packages/django/template/backends/django.py" in render
  66.             return self.template.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render
  207.                     return self._render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in _render
  199.         return self.nodelist.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/loader_tags.py" in render
  177.             return compiled_parent._render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in _render
  199.         return self.nodelist.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/defaulttags.py" in render
  322.                 return nodelist.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/loader_tags.py" in render
  72.                 result = block.nodelist.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File "/usr/local/lib/python3.5/dist-packages/django/template/defaulttags.py" in render
  458.             url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)

File "/usr/local/lib/python3.5/dist-packages/django/urls/base.py" in reverse
  91.     return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))

File "/usr/local/lib/python3.5/dist-packages/django/urls/resolvers.py" in _reverse_with_prefix
  497.         raise NoReverseMatch(msg)

Exception Type: NoReverseMatch at /apps/hello-world/sandbox
Exception Value: Reverse for 'webapp_detail' with arguments '('Hello world',)' not found. 1 pattern(s) tried: ['apps/(?P<docker_name>[\\w-]+)$']