diff --git a/frontpage/routes.py b/frontpage/routes.py
index b9efc27..02da5f4 100644
--- a/frontpage/routes.py
+++ b/frontpage/routes.py
@@ -29,7 +29,7 @@ def register(auth: OIDCAuthentication, auth_provider: str) -> Blueprint:
         Renders the home route.
         """
         user_session = UserSession(flask.session)
-        groups: List[str] = user_session.userinfo["groups"]
+        groups: List[str] = user_session.userinfo.get("groups") or []
 
         config: Config = current_config()
         name = config.core.name