Add fallback for serialnumber (#66553)

homeassistant/components/philips_js/__init__.py

@@ -148,9 +148,12 @@ class PhilipsTVDataUpdateCoordinator(DataUpdateCoordinator[None]):
     @property
     def unique_id(self) -> str:
         """Return the system descriptor."""
-        assert self.config_entry
-        assert self.config_entry.unique_id
-        return self.config_entry.unique_id
+        entry: ConfigEntry = self.config_entry
+        assert entry
+        if entry.unique_id:
+            return entry.unique_id
+        assert entry.entry_id
+        return entry.entry_id
 
     @property
     def _notify_wanted(self):

homeassistant/components/philips_js/config_flow.py

@@ -122,9 +122,9 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
                 LOGGER.exception("Unexpected exception")
                 errors["base"] = "unknown"
             else:
-
-                await self.async_set_unique_id(hub.system["serialnumber"])
-                self._abort_if_unique_id_configured()
+                if serialnumber := hub.system.get("serialnumber"):
+                    await self.async_set_unique_id(serialnumber)
+                    self._abort_if_unique_id_configured()
 
                 self._current[CONF_SYSTEM] = hub.system
                 self._current[CONF_API_VERSION] = hub.api_version