diff --git a/homeassistant/components/webostv/device_trigger.py b/homeassistant/components/webostv/device_trigger.py
index f16b1cec4f5..877c607f939 100644
--- a/homeassistant/components/webostv/device_trigger.py
+++ b/homeassistant/components/webostv/device_trigger.py
@@ -15,7 +15,6 @@ from homeassistant.helpers.trigger import TriggerActionType, TriggerInfo
 from homeassistant.helpers.typing import ConfigType
 
 from . import trigger
-from .const import DOMAIN
 from .helpers import (
     async_get_client_by_device_entry,
     async_get_device_entry_by_device_id,
@@ -43,8 +42,7 @@ async def async_validate_trigger_config(
         device_id = config[CONF_DEVICE_ID]
         try:
             device = async_get_device_entry_by_device_id(hass, device_id)
-            if DOMAIN in hass.data:
-                async_get_client_by_device_entry(hass, device)
+            async_get_client_by_device_entry(hass, device)
         except ValueError as err:
             raise InvalidDeviceAutomationConfig(err) from err
 
diff --git a/homeassistant/components/webostv/helpers.py b/homeassistant/components/webostv/helpers.py
index f6b5fa04d86..63724069f17 100644
--- a/homeassistant/components/webostv/helpers.py
+++ b/homeassistant/components/webostv/helpers.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 
 from aiowebostv import WebOsClient
 
+from homeassistant.config_entries import ConfigEntryState
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import device_registry as dr, entity_registry as er
 from homeassistant.helpers.device_registry import DeviceEntry
@@ -55,16 +56,18 @@ def async_get_client_by_device_entry(
     Raises ValueError if client is not found.
     """
     for config_entry_id in device.config_entries:
-        if entry := hass.config_entries.async_get_entry(config_entry_id):
-            client = entry.runtime_data
-            break
+        entry = hass.config_entries.async_get_entry(config_entry_id)
+        if entry and entry.domain == DOMAIN:
+            if entry.state is ConfigEntryState.LOADED:
+                return entry.runtime_data
 
-    if not client:
-        raise ValueError(
-            f"Device {device.id} is not from an existing {DOMAIN} config entry"
-        )
+            raise ValueError(
+                f"Device {device.id} is not from a loaded {DOMAIN} config entry"
+            )
 
-    return client
+    raise ValueError(
+        f"Device {device.id} is not from an existing {DOMAIN} config entry"
+    )
 
 
 async def async_get_sources(host: str, key: str) -> list[str]:
diff --git a/tests/components/webostv/test_device_trigger.py b/tests/components/webostv/test_device_trigger.py
index 5c3d7d63346..284cd8ad108 100644
--- a/tests/components/webostv/test_device_trigger.py
+++ b/tests/components/webostv/test_device_trigger.py
@@ -104,10 +104,10 @@ async def test_if_fires_on_turn_on_request(
     assert service_calls[2].data["id"] == 0
 
 
-async def test_failure_scenarios(
+async def test_invalid_trigger_raises(
     hass: HomeAssistant, device_registry: dr.DeviceRegistry, client
 ) -> None:
-    """Test failure scenarios."""
+    """Test invalid trigger platform or device id raises."""
     await setup_webostv(hass)
 
     # Test wrong trigger platform type
@@ -128,7 +128,26 @@ async def test_failure_scenarios(
             },
         )
 
-    entry = MockConfigEntry(domain="fake", state=ConfigEntryState.LOADED, data={})
+
+@pytest.mark.parametrize(
+    ("domain", "entry_state"),
+    [
+        (DOMAIN, ConfigEntryState.NOT_LOADED),
+        ("fake", ConfigEntryState.LOADED),
+    ],
+)
+async def test_invalid_entry_raises(
+    hass: HomeAssistant,
+    device_registry: dr.DeviceRegistry,
+    client,
+    caplog: pytest.LogCaptureFixture,
+    domain: str,
+    entry_state: ConfigEntryState,
+) -> None:
+    """Test device id not loaded or from another domain raises."""
+    await setup_webostv(hass)
+
+    entry = MockConfigEntry(domain=domain, state=entry_state, data={})
     entry.runtime_data = None
     entry.add_to_hass(hass)