Device: Tapo H500 hub (with a Tapo radiator valve paired) python-kasa: 0.10.2 (via Home Assistant 2026.9.4, tplink integration, Python 3.14)

What happens

Adding the H500 in Home Assistant (TP-Link Smart Home → host) authenticates successfully, then fails with "Unknown error occurred". The same happens on HA 2026.6.1.

Traceback

File "kasa/smartcam/smartcamdevice.py", line 222, in _negotiate
await self._initialize_children()
File "kasa/smartcam/smartcamdevice.py", line 148, in _initialize_children
resp = await self.protocol.query(child_info_query)
File "kasa/protocols/smartprotocol.py", line 135, in query
File "kasa/protocols/smartprotocol.py", line 140, in _query
File "kasa/protocols/smartcamprotocol.py", line 153, in _execute_query
return await self._execute_multiple_query(
File "kasa/protocols/smartprotocol.py", line 300, in _execute_multiple_query
await self._handle_response_lists(
RuntimeError: coroutine raised StopIteration

Likely cause

In SmartProtocol._handle_response_lists, response_list_name = next(iter([key for key in response_result if isinstance(response_result[key], list)])) raises StopIteration when the response contains start_index and sum but no list-valued key. Inside a coroutine that becomes RuntimeError (PEP 479). One of the H500's responses to getChildDeviceList / getChildDeviceComponentList (childControl, start_index: 0) appears to be shaped like that.

A guard would avoid the crash, e.g.:

response_list_name = next(
(k for k, v in response_result.items() if isinstance(v, list)), None
)
if response_list_name is None:
return

I can provide a dump_devinfo fixture if helpful.