diff --git a/homeassistant/components/webostv/notify.py b/homeassistant/components/webostv/notify.py
index 46f0086e0f6a0ce9371a313fb7bc0086f8a82b99..82e618561879050fb671448662fc2efb4990e156 100644
--- a/homeassistant/components/webostv/notify.py
+++ b/homeassistant/components/webostv/notify.py
@@ -7,7 +7,7 @@ from typing import Any
 from aiowebostv import WebOsClient, WebOsTvPairError
 
 from homeassistant.components.notify import ATTR_DATA, BaseNotificationService
-from homeassistant.const import CONF_ICON
+from homeassistant.const import ATTR_ICON
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
@@ -46,8 +46,8 @@ class LgWebOSNotificationService(BaseNotificationService):
             if not self._client.is_connected():
                 await self._client.connect()
 
-            data = kwargs.get(ATTR_DATA)
-            icon_path = data.get(CONF_ICON) if data else None
+            data = kwargs[ATTR_DATA]
+            icon_path = data.get(ATTR_ICON) if data else None
             await self._client.send_message(message, icon_path=icon_path)
         except WebOsTvPairError:
             _LOGGER.error("Pairing with TV failed")
diff --git a/tests/components/webostv/test_notify.py b/tests/components/webostv/test_notify.py
index 7e150c6eb7828d526dc544663d06e90ab2a8bc84..92fb151c1b34e60008c2fd60ee8a74fbc65ae58d 100644
--- a/tests/components/webostv/test_notify.py
+++ b/tests/components/webostv/test_notify.py
@@ -4,9 +4,13 @@ from unittest.mock import Mock, call
 from aiowebostv import WebOsTvPairError
 import pytest
 
-from homeassistant.components.notify import ATTR_MESSAGE, DOMAIN as NOTIFY_DOMAIN
+from homeassistant.components.notify import (
+    ATTR_DATA,
+    ATTR_MESSAGE,
+    DOMAIN as NOTIFY_DOMAIN,
+)
 from homeassistant.components.webostv import DOMAIN
-from homeassistant.const import CONF_ICON, CONF_SERVICE_DATA
+from homeassistant.const import ATTR_ICON
 from homeassistant.setup import async_setup_component
 
 from . import setup_webostv
@@ -26,8 +30,8 @@ async def test_notify(hass, client):
         TV_NAME,
         {
             ATTR_MESSAGE: MESSAGE,
-            CONF_SERVICE_DATA: {
-                CONF_ICON: ICON_PATH,
+            ATTR_DATA: {
+                ATTR_ICON: ICON_PATH,
             },
         },
         blocking=True,
@@ -41,7 +45,7 @@ async def test_notify(hass, client):
         TV_NAME,
         {
             ATTR_MESSAGE: MESSAGE,
-            CONF_SERVICE_DATA: {
+            ATTR_DATA: {
                 "OTHER_DATA": "not_used",
             },
         },
@@ -51,6 +55,20 @@ async def test_notify(hass, client):
     assert client.connect.call_count == 1
     client.send_message.assert_called_with(MESSAGE, icon_path=None)
 
+    await hass.services.async_call(
+        NOTIFY_DOMAIN,
+        TV_NAME,
+        {
+            ATTR_MESSAGE: "only message, no data",
+        },
+        blocking=True,
+    )
+
+    assert client.connect.call_count == 1
+    assert client.send_message.call_args == call(
+        "only message, no data", icon_path=None
+    )
+
 
 async def test_notify_not_connected(hass, client, monkeypatch):
     """Test sending a message when client is not connected."""
@@ -63,8 +81,8 @@ async def test_notify_not_connected(hass, client, monkeypatch):
         TV_NAME,
         {
             ATTR_MESSAGE: MESSAGE,
-            CONF_SERVICE_DATA: {
-                CONF_ICON: ICON_PATH,
+            ATTR_DATA: {
+                ATTR_ICON: ICON_PATH,
             },
         },
         blocking=True,
@@ -85,8 +103,8 @@ async def test_icon_not_found(hass, caplog, client, monkeypatch):
         TV_NAME,
         {
             ATTR_MESSAGE: MESSAGE,
-            CONF_SERVICE_DATA: {
-                CONF_ICON: ICON_PATH,
+            ATTR_DATA: {
+                ATTR_ICON: ICON_PATH,
             },
         },
         blocking=True,
@@ -116,8 +134,8 @@ async def test_connection_errors(hass, caplog, client, monkeypatch, side_effect,
         TV_NAME,
         {
             ATTR_MESSAGE: MESSAGE,
-            CONF_SERVICE_DATA: {
-                CONF_ICON: ICON_PATH,
+            ATTR_DATA: {
+                ATTR_ICON: ICON_PATH,
             },
         },
         blocking=True,