CMK version:
2.5.0p9 pro
OS version:
Oracle Linux 8.9
Error message:
After update to 2.5.0p9 pro docker and kubernetes monitoring stop working
dcd.log
2026-07-21 11:20:28,086 [40] [cmk.dcd.Manager] Error during processing: ('500 Server Error: INTERNAL SERVER ERROR for url: http://localhost:5000/checkmk/check_mk/api/internal/domain-types/host_config/collections/all',)
TypeError: 'NoneType' object is not subscriptable. Crash report generated. Please submit.
For further details please check web.log
2026-07-21 11:20:28,086 [40] [cmk.dcd.Manager] Trace:
Traceback (most recent call last):
File "/omd/sites/checkmk/lib/python3/cmk/nonfree/pro/dcd/_site_commander.py", line 260, in run
self._process_batches(
~~~~~~~~~~~~~~~~~~~~~^
batches,
^^^^^^^^
...<4 lines>...
connection_ids,
^^^^^^^^^^^^^^^
)
^
File "/omd/sites/checkmk/lib/python3/cmk/nonfree/pro/dcd/_site_commander.py", line 324, in _process_batches
res = self._apply_site_changes(work_batches, mode, skipped_batch_ids)
File "/omd/sites/checkmk/lib/python3/cmk/nonfree/pro/dcd/_site_commander.py", line 372, in _apply_site_changes
transaction = self._initiate_new_cycle(batches, mode, skipped_work_ids)
File "/omd/sites/checkmk/lib/python3/cmk/nonfree/pro/dcd/_site_commander.py", line 449, in _initiate_new_cycle
hosts = self.client.get_all_hosts().value
~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/omd/sites/checkmk/lib/python3/cmk/nonfree/pro/dcd/site_api/_rest_client.py", line 245, in get_all_hosts
self.extended_raise_for_status(response)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "/omd/sites/checkmk/lib/python3/cmk/nonfree/pro/dcd/site_api/_rest_client.py", line 346, in extended_raise_for_status
raise HTTPError(
...<2 lines>...
) from None
requests.exceptions.HTTPError: ('500 Server Error: INTERNAL SERVER ERROR for url: http://localhost:5000/checkmk/check_mk/api/internal/domain-types/host_config/collections/all',)
TypeError: 'NoneType' object is not subscriptable. Crash report generated. Please submit.
For further details please check web.log
web.log
2026-07-21 11:20:28,076 [40] [cmk.gui.wsgi.rest_api 1576955] Unhandled exception (Crash-ID: 69b01f00-84e5-11f1-98d3-00155de0790b)
Traceback (most recent call last):
File "/omd/sites/checkmk/lib/python3/cmk/gui/wsgi/applications/rest_api.py", line 758, in wsgi_app
return wsgi_endpoint(environ, start_response)
File "/omd/sites/checkmk/lib/python3/cmk/gui/wsgi/applications/utils.py", line 48, in __call__
return self.wsgi_app(environ, start_response)
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
File "/omd/sites/checkmk/lib/python3/cmk/gui/wsgi/applications/rest_api.py", line 216, in wsgi_app
return self._handle_request(environ, start_response, None)
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/omd/sites/checkmk/lib/python3/cmk/gui/wsgi/applications/rest_api.py", line 245, in _handle_request
response = handle_endpoint_request(
endpoint=self.endpoint.request_endpoint(),
...<5 lines>...
is_testing=is_testing,
)
File "/omd/sites/checkmk/lib/python3.13/site-packages/cmk/trace/_tracer.py", line 45, in wrapper
return func(*args, **kwargs)
File "/omd/sites/checkmk/lib/python3/cmk/gui/openapi/framework/handler.py", line 203, in handle_endpoint_request
raw_response = endpoint.handler(*bound_arguments.args, **bound_arguments.kwargs)
File "/omd/sites/checkmk/lib/python3/cmk/gui/openapi/api_endpoints/host_config/list_hosts.py", line 121, in list_hosts_v1
return serialize_host_collection(
[host for host in filter(hosts_filter, hosts)],
compute_effective_attributes=compute.effective_attributes,
compute_links=compute.links,
)
File "/omd/sites/checkmk/lib/python3/cmk/gui/openapi/api_endpoints/host_config/_utils.py", line 123, in serialize_host_collection
serialize_host(
~~~~~~~~~~~~~~^
host=host,
^^^^^^^^^^
compute_links=compute_links,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
compute_effective_attributes=compute_effective_attributes,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/omd/sites/checkmk/lib/python3/cmk/gui/openapi/api_endpoints/host_config/_utils.py", line 97, in serialize_host
attributes=HostViewAttributeModel.from_internal(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
host.attributes, _static_attribute_names
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
),
^
File "/omd/sites/checkmk/lib/python3/cmk/gui/openapi/api_endpoints/models/host_attribute_models.py", line 381, in from_internal
management_snmp_community=SNMPCredentialsConverter.from_internal(
value["management_snmp_community"]
)
File "/omd/sites/checkmk/lib/python3/cmk/gui/openapi/api_endpoints/models/attributes.py", line 196, in from_internal
match value[0]:
~~~~~^^^
TypeError: 'NoneType' object is not subscriptable
crash-agent.txt (3.2 KB)
crash-rest_api.txt (3.7 KB)
