diff --git a/homeassistant/components/google_assistant/helpers.py b/homeassistant/components/google_assistant/helpers.py
index 8ec2bce4602..48664bff395 100644
--- a/homeassistant/components/google_assistant/helpers.py
+++ b/homeassistant/components/google_assistant/helpers.py
@@ -343,6 +343,15 @@ class GoogleEntity:
         state = self.state
         domain = state.domain
         features = state.attributes.get(ATTR_SUPPORTED_FEATURES, 0)
+
+        if not isinstance(features, int):
+            _LOGGER.warning(
+                "Entity %s contains invalid supported_features value %s",
+                self.entity_id,
+                features,
+            )
+            return []
+
         device_class = state.attributes.get(ATTR_DEVICE_CLASS)
 
         self._traits = [
diff --git a/tests/components/google_assistant/test_helpers.py b/tests/components/google_assistant/test_helpers.py
index 2bd68926da1..87e3cac657c 100644
--- a/tests/components/google_assistant/test_helpers.py
+++ b/tests/components/google_assistant/test_helpers.py
@@ -9,6 +9,7 @@ from homeassistant.components.google_assistant.const import (  # noqa: F401
     NOT_EXPOSE_LOCAL,
 )
 from homeassistant.config import async_process_ha_core_config
+from homeassistant.core import State
 from homeassistant.setup import async_setup_component
 from homeassistant.util import dt
 
@@ -242,3 +243,12 @@ async def test_sync_entities_all(agents, result):
         res = await config.async_sync_entities_all()
         assert sorted(mock.mock_calls) == sorted([call(agent) for agent in agents])
         assert res == result
+
+
+def test_supported_features_string(caplog):
+    """Test bad supported features."""
+    entity = helpers.GoogleEntity(
+        None, None, State("test.entity_id", "on", {"supported_features": "invalid"})
+    )
+    assert entity.is_supported() is False
+    assert "Entity test.entity_id contains invalid supported_features value invalid"