diff --git a/homeassistant/components/hassio/const.py b/homeassistant/components/hassio/const.py
index 417a62a1a8c..435d42349fd 100644
--- a/homeassistant/components/hassio/const.py
+++ b/homeassistant/components/hassio/const.py
@@ -21,6 +21,7 @@ ATTR_UUID = "uuid"
 ATTR_WS_EVENT = "event"
 ATTR_ENDPOINT = "endpoint"
 ATTR_METHOD = "method"
+ATTR_RESULT = "result"
 ATTR_TIMEOUT = "timeout"
 
 
diff --git a/homeassistant/components/hassio/websocket_api.py b/homeassistant/components/hassio/websocket_api.py
index 387aa926489..dfc2b7dc01d 100644
--- a/homeassistant/components/hassio/websocket_api.py
+++ b/homeassistant/components/hassio/websocket_api.py
@@ -16,6 +16,7 @@ from .const import (
     ATTR_DATA,
     ATTR_ENDPOINT,
     ATTR_METHOD,
+    ATTR_RESULT,
     ATTR_TIMEOUT,
     ATTR_WS_EVENT,
     DOMAIN,
@@ -94,7 +95,6 @@ async def websocket_supervisor_api(
 ):
     """Websocket handler to call Supervisor API."""
     supervisor: HassIO = hass.data[DOMAIN]
-    result = False
     try:
         result = await supervisor.send_command(
             msg[ATTR_ENDPOINT],
@@ -102,6 +102,9 @@ async def websocket_supervisor_api(
             timeout=msg.get(ATTR_TIMEOUT, 10),
             payload=msg.get(ATTR_DATA, {}),
         )
+
+        if result.get(ATTR_RESULT) == "error":
+            raise hass.components.hassio.HassioAPIError(result.get("message"))
     except hass.components.hassio.HassioAPIError as err:
         _LOGGER.error("Failed to to call %s - %s", msg[ATTR_ENDPOINT], err)
         connection.send_error(
diff --git a/tests/components/hassio/test_websocket_api.py b/tests/components/hassio/test_websocket_api.py
index dcf6b64d9e2..5278d2cbb91 100644
--- a/tests/components/hassio/test_websocket_api.py
+++ b/tests/components/hassio/test_websocket_api.py
@@ -88,3 +88,27 @@ async def test_websocket_supervisor_api(
 
     msg = await websocket_client.receive_json()
     assert msg["result"]["version_latest"] == "1.0.0"
+
+
+async def test_websocket_supervisor_api_error(
+    hassio_env, hass: HomeAssistant, hass_ws_client, aioclient_mock
+):
+    """Test Supervisor websocket api error."""
+    assert await async_setup_component(hass, "hassio", {})
+    websocket_client = await hass_ws_client(hass)
+    aioclient_mock.get(
+        "http://127.0.0.1/ping",
+        json={"result": "error", "message": "example error"},
+    )
+
+    await websocket_client.send_json(
+        {
+            WS_ID: 1,
+            WS_TYPE: WS_TYPE_API,
+            ATTR_ENDPOINT: "/ping",
+            ATTR_METHOD: "get",
+        }
+    )
+
+    msg = await websocket_client.receive_json()
+    assert msg["error"]["message"] == "example error"