diff --git a/apps/desktop/src/main.tsx b/apps/desktop/src/main.tsx
index 4ff85a0..f57afc5 100644
--- a/apps/desktop/src/main.tsx
+++ b/apps/desktop/src/main.tsx
@@ -737,6 +737,10 @@ const resolvedAppUrl = useMemo(() => {
   const syncRemoteAccessNow = useCallback(
     async (info: RustdeskInfo, allowRetry = true) => {
       if (!store) return
+      if (!config?.machineId) {
+        logDesktop("remoteAccess:sync:skipped", { reason: "unregistered" })
+        return
+      }
       const payload = buildRemoteAccessPayload(info)
       if (!payload) return