Don't attempt to set Vizio is_volume_muted property if Vizio API doesn't provide muted state (#34782)

homeassistant/components/vizio/media_player.py

@@ -132,7 +132,7 @@ class VizioDevice(MediaPlayerEntity):
         self._state = None
         self._volume_level = None
         self._volume_step = config_entry.options[CONF_VOLUME_STEP]
-        self._is_muted = None
+        self._is_volume_muted = None
         self._current_input = None
         self._current_app = None
         self._current_app_config = None
@@ -190,7 +190,7 @@ class VizioDevice(MediaPlayerEntity):
         if not is_on:
             self._state = STATE_OFF
             self._volume_level = None
-            self._is_muted = None
+            self._is_volume_muted = None
             self._current_input = None
             self._available_inputs = None
             self._current_app = None
@@ -207,7 +207,10 @@ class VizioDevice(MediaPlayerEntity):
         )
         if audio_settings is not None:
             self._volume_level = float(audio_settings["volume"]) / self._max_volume
-            self._is_muted = audio_settings["mute"].lower() == "on"
+            if "mute" in audio_settings:
+                self._is_volume_muted = audio_settings["mute"].lower() == "on"
+            else:
+                self._is_volume_muted = None
 
             if VIZIO_SOUND_MODE in audio_settings:
                 self._supported_commands |= SUPPORT_SELECT_SOUND_MODE
@@ -324,7 +327,7 @@ class VizioDevice(MediaPlayerEntity):
     @property
     def is_volume_muted(self):
         """Boolean if volume is currently muted."""
-        return self._is_muted
+        return self._is_volume_muted
 
     @property
     def source(self) -> str:
@@ -428,10 +431,10 @@ class VizioDevice(MediaPlayerEntity):
         """Mute the volume."""
         if mute:
             await self._device.mute_on()
-            self._is_muted = True
+            self._is_volume_muted = True
         else:
             await self._device.mute_off()
-            self._is_muted = False
+            self._is_volume_muted = False
 
     async def async_media_previous_track(self) -> None:
         """Send previous channel command."""

tests/components/vizio/test_media_player.py

@@ -621,3 +621,26 @@ async def test_setup_with_no_running_app(
         assert attr["source"] == "CAST"
         assert "app_id" not in attr
         assert "app_name" not in attr
+
+
+async def test_setup_tv_without_mute(
+    hass: HomeAssistantType,
+    vizio_connect: pytest.fixture,
+    vizio_update: pytest.fixture,
+) -> None:
+    """Test Vizio TV entity setup when mute property isn't returned by Vizio API."""
+    config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data=vol.Schema(VIZIO_SCHEMA)(MOCK_USER_VALID_TV_CONFIG),
+        unique_id=UNIQUE_ID,
+    )
+
+    async with _cm_for_test_setup_without_apps(
+        {"volume": int(MAX_VOLUME[VIZIO_DEVICE_CLASS_TV] / 2)}, STATE_ON,
+    ):
+        await _add_config_entry_to_hass(hass, config_entry)
+
+        attr = _get_attr_and_assert_base_attr(hass, DEVICE_CLASS_TV, STATE_ON)
+        _assert_sources_and_volume(attr, VIZIO_DEVICE_CLASS_TV)
+        assert "sound_mode" not in attr
+        assert "is_volume_muted" not in attr