I got two exceptions which seem related. I'm not sure how to replicate this.
AttributeError: 'int' object has no attribute 'label'
File "django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "django/core/handlers/base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "django/core/handlers/base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "django/views/generic/base.py", line 71, in view
return self.dispatch(request, *args, **kwargs)
File "rest_framework/views.py", line 505, in dispatch
response = self.handle_exception(exc)
File "rest_framework/views.py", line 465, in handle_exception
self.raise_uncaught_exception(exc)
File "rest_framework/views.py", line 476, in raise_uncaught_exception
raise exc
File "rest_framework/views.py", line 502, in dispatch
response = handler(request, *args, **kwargs)
File "openwisp_network_topology/api/views.py", line 70, in post
topology.receive(request.data)
File "openwisp_network_topology/base/topology.py", line 352, in receive
self.update(data)
File "openwisp_network_topology/base/topology.py", line 287, in update
self._update_added_items(diff['added'])
File "openwisp_network_topology/base/topology.py", line 193, in _update_added_items
self._update_node_properties(node, node_dict, section='added')
File "openwisp_network_topology/base/topology.py", line 230, in _update_node_properties
if node.label != node_dict['label']:
AttributeError: 'NoneType' object has no attribute 'label'
File "django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "django/core/handlers/base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "django/core/handlers/base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "django/views/generic/base.py", line 71, in view
return self.dispatch(request, *args, **kwargs)
File "rest_framework/views.py", line 505, in dispatch
response = self.handle_exception(exc)
File "rest_framework/views.py", line 465, in handle_exception
self.raise_uncaught_exception(exc)
File "rest_framework/views.py", line 476, in raise_uncaught_exception
raise exc
File "rest_framework/views.py", line 502, in dispatch
response = handler(request, *args, **kwargs)
File "openwisp_network_topology/api/views.py", line 70, in post
topology.receive(request.data)
File "openwisp_network_topology/base/topology.py", line 352, in receive
self.update(data)
File "openwisp_network_topology/base/topology.py", line 289, in update
self._update_changed_items(diff['changed'])
File "openwisp_network_topology/base/topology.py", line 270, in _update_changed_items
self._update_node_properties(node, node_dict, section=section)
File "openwisp_network_topology/base/topology.py", line 230, in _update_node_properties
if node.label != node_dict['label']: