diff --git a/homeassistant/components/google_assistant/smart_home.py b/homeassistant/components/google_assistant/smart_home.py
index f2aea247ecd..805c9100d9f 100644
--- a/homeassistant/components/google_assistant/smart_home.py
+++ b/homeassistant/components/google_assistant/smart_home.py
@@ -248,6 +248,7 @@ async def async_devices_disconnect(hass, data: RequestData, payload):
 
     https://developers.google.com/assistant/smarthome/develop/process-intents#DISCONNECT
     """
+    assert data.context.user_id is not None
     await data.config.async_disconnect_agent_user(data.context.user_id)
     return None
 
diff --git a/homeassistant/core.py b/homeassistant/core.py
index 27dba3cbc52..8c662afce48 100644
--- a/homeassistant/core.py
+++ b/homeassistant/core.py
@@ -701,7 +701,7 @@ class HomeAssistant:
 class Context:
     """The context that triggered something."""
 
-    user_id: str = attr.ib(default=None)
+    user_id: str | None = attr.ib(default=None)
     parent_id: str | None = attr.ib(default=None)
     id: str = attr.ib(factory=uuid_util.random_uuid_hex)