diff --git a/homeassistant/components/humidifier/intent.py b/homeassistant/components/humidifier/intent.py
index d949874cc67..103521aeb04 100644
--- a/homeassistant/components/humidifier/intent.py
+++ b/homeassistant/components/humidifier/intent.py
@@ -110,7 +110,7 @@ class SetModeHandler(intent.IntentHandler):
         intent.async_test_feature(state, HumidifierEntityFeature.MODES, "modes")
         mode = slots["mode"]["value"]
 
-        if mode not in state.attributes.get(ATTR_AVAILABLE_MODES, []):
+        if mode not in (state.attributes.get(ATTR_AVAILABLE_MODES) or []):
             raise intent.IntentHandleError(
                 f"Entity {state.name} does not support {mode} mode"
             )
diff --git a/tests/components/humidifier/test_intent.py b/tests/components/humidifier/test_intent.py
index cbdd5c3da26..d8c9f199f57 100644
--- a/tests/components/humidifier/test_intent.py
+++ b/tests/components/humidifier/test_intent.py
@@ -188,7 +188,10 @@ async def test_intent_set_mode_tests_feature(hass: HomeAssistant) -> None:
     assert len(mode_calls) == 0
 
 
-async def test_intent_set_unknown_mode(hass: HomeAssistant) -> None:
+@pytest.mark.parametrize("available_modes", (["home", "away"], None))
+async def test_intent_set_unknown_mode(
+    hass: HomeAssistant, available_modes: list[str] | None
+) -> None:
     """Test the set mode intent for unsupported mode."""
     hass.states.async_set(
         "humidifier.bedroom_humidifier",
@@ -196,8 +199,8 @@ async def test_intent_set_unknown_mode(hass: HomeAssistant) -> None:
         {
             ATTR_HUMIDITY: 40,
             ATTR_SUPPORTED_FEATURES: 1,
-            ATTR_AVAILABLE_MODES: ["home", "away"],
-            ATTR_MODE: "home",
+            ATTR_AVAILABLE_MODES: available_modes,
+            ATTR_MODE: None,
         },
     )
     mode_calls = async_mock_service(hass, DOMAIN, SERVICE_SET_MODE)