diff --git a/frontend/src/routes/form/[slug]/+page.server.ts b/frontend/src/routes/form/[slug]/+page.server.ts
index b4d16e9..ac77798 100644
--- a/frontend/src/routes/form/[slug]/+page.server.ts
+++ b/frontend/src/routes/form/[slug]/+page.server.ts
@@ -74,6 +74,10 @@ export async function load(
       };
     } else if (session_res.status === 403) {
       return error(session_res.status, "Already answered");
+    } else if (session_res.status === 401) {
+      // External Code is expired
+      cookies.delete("external-code", { path: "/" });
+      return redirect(301, `/form/${params.slug}`);
     } else if (!session.success) {
       return error(session_res.status, session.errors[0]);
     }