Issues upgrading to 3.1.1

[uck9]

Upgraded my main instance of netbox from 3.0.11 to 3.1.1 and was working fine for a while but then displayed the following after progressing through the login page:

Server Error
There was a problem with your request. Please contact an administrator.

The complete exception is provided below:

<class 'AttributeError'>

'NoneType' object has no attribute '_base_manager'

Python version: 3.8.10
NetBox version: 3.1.1
If further assistance is required, please post to the NetBox discussion forum on GitHub.

Attempted the same upgrade from 3.0.9 to 3.1.1 on my lab instance and hit the same issue.

Further logs:

Internal Server Error: /
Traceback (most recent call last):
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 829, in _resolve_lookup
current = current[bit]
TypeError: 'ObjectChange' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/views/generic/base.py", line 70, in view
return self.dispatch(request, *args, **kwargs)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/views/generic/base.py", line 98, in dispatch
return handler(request, *args, **kwargs)
File "/opt/netbox/netbox/netbox/views/init.py", line 150, in get
return render(request, self.template_name, {
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/shortcuts.py", line 19, in render
content = loader.render_to_string(template_name, context, request, using=using)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/loader.py", line 62, in render_to_string
return template.render(context, request)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/backends/django.py", line 61, in render
return self.template.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 170, in render
return self._render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/test/utils.py", line 100, in instrumented_test_render
return self.nodelist.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 938, in render
bit = node.render_annotated(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/loader_tags.py", line 150, in render
return compiled_parent._render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/test/utils.py", line 100, in instrumented_test_render
return self.nodelist.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 938, in render
bit = node.render_annotated(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/loader_tags.py", line 150, in render
return compiled_parent._render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/test/utils.py", line 100, in instrumented_test_render
return self.nodelist.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 938, in render
bit = node.render_annotated(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/loader_tags.py", line 62, in render
result = block.nodelist.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 938, in render
bit = node.render_annotated(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/loader_tags.py", line 62, in render
result = block.nodelist.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 938, in render
bit = node.render_annotated(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/defaulttags.py", line 312, in render
return nodelist.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 938, in render
bit = node.render_annotated(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django_tables2/templatetags/django_tables2.py", line 167, in render
return template.render(context={"table": table}, request=request)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/backends/django.py", line 61, in render
return self.template.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 170, in render
return self._render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/test/utils.py", line 100, in instrumented_test_render
return self.nodelist.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 938, in render
bit = node.render_annotated(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/defaulttags.py", line 211, in render
nodelist.append(node.render_annotated(context))
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/defaulttags.py", line 167, in render
values = list(values)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django_tables2/rows.py", line 244, in items
column.current_value = self.get_cell(column.name)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django_tables2/rows.py", line 197, in get_cell
return self._get_and_render_with(
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django_tables2/rows.py", line 173, in _get_and_render_with
return render_func(bound_column, value)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django_tables2/rows.py", line 206, in _call_render
content = call_with_appropriate(bound_column.render, render_kwargs)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django_tables2/utils.py", line 572, in call_with_appropriate
return fn(**kwargs)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django_tables2/columns/templatecolumn.py", line 66, in render
return Template(self.template_code).render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 172, in render
return self._render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/test/utils.py", line 100, in instrumented_test_render
return self.nodelist.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 938, in render
bit = node.render_annotated(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 905, in render_annotated
return self.render(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/defaulttags.py", line 305, in render
match = condition.eval(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/defaulttags.py", line 889, in eval
return self.value.resolve(context, ignore_failures=True)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 671, in resolve
obj = self.var.resolve(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 796, in resolve
value = self._resolve_lookup(context)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/template/base.py", line 837, in _resolve_lookup
current = getattr(current, bit)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/contrib/contenttypes/fields.py", line 241, in get
rel_obj = ct.get_object_for_this_type(pk=pk_val)
File "/opt/netbox-3.1.1/venv/lib/python3.8/site-packages/django/contrib/contenttypes/models.py", line 175, in get_object_for_this_type
return self.model_class()._base_manager.using(self._state.db).get(**kwargs)
AttributeError: 'NoneType' object has no attribute '_base_manager'
Not Found: /favicon.ico

Anyone seen similar and has an idea of a fix?

[rodvand]

Do you have any plugins installed? I saw the same failure when I upgraded an installation which had the netbox-bgp plugin installed. I had to delete all ObjectChanges referencing the netbox-bgp plugin.

[uck9]

Yeah the plugin was the issue. Been running the onboarding plugin but hadn't installed. Caused issues because I'd run some plugin tasks just prior to upgrade and they were appearing in the Change Log table on the front page. A reload of the plugin fixed it. Cheers for the pointer.