From 323c3faad15c1ff8adc2255a4a2f2e220527a8c9 Mon Sep 17 00:00:00 2001
From: Erik Montnemery <erik@montnemery.com>
Date: Tue, 15 Sep 2026 20:03:38 +0200
Subject: [PATCH] Don't blow up in select services when there are no options
 (#182313)

---
 homeassistant/components/select/__init__.py  | 20 +++++--
 homeassistant/components/select/strings.json |  3 +
 tests/components/select/test_init.py         | 63 ++++++++++++++++++++
 3 files changed, 82 insertions(+), 4 deletions(-)

diff --git a/homeassistant/components/select/__init__.py b/homeassistant/components/select/__init__.py
index 28f58a2a9948..d502a27c93cb 100644
--- a/homeassistant/components/select/__init__.py
+++ b/homeassistant/components/select/__init__.py
@@ -167,6 +167,18 @@ class SelectEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
         """Return the selected entity option to represent the entity state."""
         return self._attr_current_option
 
+    @final
+    @callback
+    def _options_or_raise(self) -> list[str]:
+        """Return the options, raise ServiceValidationError if there are none."""
+        if not (options := self.options):
+            raise ServiceValidationError(
+                translation_domain=DOMAIN,
+                translation_key="no_options",
+                translation_placeholders={"entity_id": self.entity_id},
+            )
+        return options
+
     @final
     @callback
     def _valid_option_or_raise(self, option: str) -> None:
@@ -235,9 +247,9 @@ class SelectEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
         """Offset current index."""
         current_index = 0
         current_option = self.current_option
-        options = self.options
-        if current_option is not None and current_option in self.options:
-            current_index = self.options.index(current_option)
+        options = self._options_or_raise()
+        if current_option is not None and current_option in options:
+            current_index = options.index(current_option)
 
         new_index = current_index + offset
         if cycle:
@@ -252,6 +264,6 @@ class SelectEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
     @final
     async def _async_select_index(self, idx: int) -> None:
         """Select new option by index."""
-        options = self.options
+        options = self._options_or_raise()
         new_index = idx % len(options)
         await self.async_select_option(options[new_index])
diff --git a/homeassistant/components/select/strings.json b/homeassistant/components/select/strings.json
index 03a05f75bd93..4f5b877d8c72 100644
--- a/homeassistant/components/select/strings.json
+++ b/homeassistant/components/select/strings.json
@@ -50,6 +50,9 @@
     }
   },
   "exceptions": {
+    "no_options": {
+      "message": "Entity {entity_id} has no options to select from."
+    },
     "not_valid_option": {
       "message": "Option {option} is not valid for entity {entity_id}, valid options are: {options}."
     }
diff --git a/tests/components/select/test_init.py b/tests/components/select/test_init.py
index a5be7921fcdd..cf510165f411 100644
--- a/tests/components/select/test_init.py
+++ b/tests/components/select/test_init.py
@@ -31,6 +31,13 @@ class MockSelectEntity(SelectEntity):
     _attr_options = ["option_one", "option_two", "option_three"]
 
 
+class MockSelectEntityWithoutOptions(MockSelectEntity):
+    """Mock SelectEntity without any options to use in tests."""
+
+    _attr_name = "select without options"
+    _attr_options: list[str] = []
+
+
 async def test_select(hass: HomeAssistant) -> None:
     """Test getting data from the mocked select entity."""
     select = MockSelectEntity()
@@ -202,3 +209,59 @@ async def test_custom_integration_and_validation(
         blocking=True,
     )
     assert hass.states.get("select.select_2").state == "option 3"
+
+
+@pytest.mark.parametrize(
+    ("service", "service_data"),
+    [
+        pytest.param(SERVICE_SELECT_FIRST, {}, id="first"),
+        pytest.param(SERVICE_SELECT_LAST, {}, id="last"),
+        pytest.param(SERVICE_SELECT_NEXT, {}, id="next_cycle"),
+        pytest.param(SERVICE_SELECT_NEXT, {ATTR_CYCLE: False}, id="next_no_cycle"),
+        pytest.param(SERVICE_SELECT_PREVIOUS, {}, id="previous_cycle"),
+        pytest.param(
+            SERVICE_SELECT_PREVIOUS, {ATTR_CYCLE: False}, id="previous_no_cycle"
+        ),
+    ],
+)
+@pytest.mark.parametrize(
+    "current_option",
+    [None, "option_one"],
+    ids=["without_current_option", "with_stale_current_option"],
+)
+async def test_navigation_services_without_options(
+    hass: HomeAssistant,
+    service: str,
+    service_data: dict[str, bool],
+    current_option: str | None,
+) -> None:
+    """Test the navigation actions on an entity which has no options."""
+    entity = MockSelectEntityWithoutOptions()
+    entity._attr_current_option = current_option
+    entity.select_option = MagicMock()
+    setup_test_component_platform(hass, DOMAIN, [entity])
+
+    assert await async_setup_component(hass, DOMAIN, {DOMAIN: {CONF_PLATFORM: "test"}})
+    await hass.async_block_till_done()
+
+    assert hass.states.get("select.select_without_options").state == STATE_UNKNOWN
+
+    with pytest.raises(ServiceValidationError) as exc:
+        await hass.services.async_call(
+            DOMAIN,
+            service,
+            {ATTR_ENTITY_ID: "select.select_without_options"} | service_data,
+            blocking=True,
+        )
+    assert exc.value.translation_domain == DOMAIN
+    assert exc.value.translation_key == "no_options"
+    assert exc.value.translation_placeholders == {
+        "entity_id": "select.select_without_options"
+    }
+    assert (
+        str(exc.value)
+        == "Entity select.select_without_options has no options to select from"
+    )
+
+    entity.select_option.assert_not_called()
+    assert hass.states.get("select.select_without_options").state == STATE_UNKNOWN