diff --git a/homeassistant/components/homekit_controller/cover.py b/homeassistant/components/homekit_controller/cover.py
index ca041d49e11..d0944db38f8 100644
--- a/homeassistant/components/homekit_controller/cover.py
+++ b/homeassistant/components/homekit_controller/cover.py
@@ -212,13 +212,15 @@ class HomeKitWindowCover(HomeKitEntity, CoverEntity):
         )
 
     @property
-    def current_cover_tilt_position(self) -> int:
+    def current_cover_tilt_position(self) -> int | None:
         """Return current position of cover tilt."""
         tilt_position = self.service.value(CharacteristicsTypes.VERTICAL_TILT_CURRENT)
         if not tilt_position:
             tilt_position = self.service.value(
                 CharacteristicsTypes.HORIZONTAL_TILT_CURRENT
             )
+        if tilt_position is None:
+            return None
         # Recalculate to convert from arcdegree scale to percentage scale.
         if self.is_vertical_tilt:
             scale = 0.9
diff --git a/tests/components/homekit_controller/test_cover.py b/tests/components/homekit_controller/test_cover.py
index 671e9779d30..2157eb51212 100644
--- a/tests/components/homekit_controller/test_cover.py
+++ b/tests/components/homekit_controller/test_cover.py
@@ -3,6 +3,7 @@
 from aiohomekit.model.characteristics import CharacteristicsTypes
 from aiohomekit.model.services import ServicesTypes
 
+from homeassistant.const import STATE_UNAVAILABLE
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import entity_registry as er
 
@@ -94,6 +95,24 @@ def create_window_covering_service_with_v_tilt_2(accessory):
     tilt_target.maxValue = 0
 
 
+def create_window_covering_service_with_none_tilt(accessory):
+    """Define a window-covering characteristics as per page 219 of HAP spec.
+
+    This accessory uses None for the tilt value unexpectedly.
+    """
+    service = create_window_covering_service(accessory)
+
+    tilt_current = service.add_char(CharacteristicsTypes.VERTICAL_TILT_CURRENT)
+    tilt_current.value = None
+    tilt_current.minValue = -90
+    tilt_current.maxValue = 0
+
+    tilt_target = service.add_char(CharacteristicsTypes.VERTICAL_TILT_TARGET)
+    tilt_target.value = None
+    tilt_target.minValue = -90
+    tilt_target.maxValue = 0
+
+
 async def test_change_window_cover_state(hass: HomeAssistant) -> None:
     """Test that we can turn a HomeKit alarm on and off again."""
     helper = await setup_test_component(hass, create_window_covering_service)
@@ -212,6 +231,21 @@ async def test_read_window_cover_tilt_vertical_2(hass: HomeAssistant) -> None:
     assert state.attributes["current_tilt_position"] == 83
 
 
+async def test_read_window_cover_tilt_missing_tilt(hass: HomeAssistant) -> None:
+    """Test that missing tilt is handled."""
+    helper = await setup_test_component(
+        hass, create_window_covering_service_with_none_tilt
+    )
+
+    await helper.async_update(
+        ServicesTypes.WINDOW_COVERING,
+        {CharacteristicsTypes.OBSTRUCTION_DETECTED: True},
+    )
+    state = await helper.poll_and_get_state()
+    assert "current_tilt_position" not in state.attributes
+    assert state.state != STATE_UNAVAILABLE
+
+
 async def test_write_window_cover_tilt_horizontal(hass: HomeAssistant) -> None:
     """Test that horizontal tilt is written correctly."""
     helper = await setup_test_component(