diff --git a/src/components/topbar/TopBar.tsx b/src/components/topbar/TopBar.tsx
index bf994c3..610852e 100644
--- a/src/components/topbar/TopBar.tsx
+++ b/src/components/topbar/TopBar.tsx
@@ -35,7 +35,7 @@ function TopBar({ profileDropState, toggleProfileDropState, toggleMenuState }: P
     const { data: notificationsCount } = useGetNotificationsCount();
     const profileData = profile?.data;
     const isLoggedIn = isSuccess && profileData;
-    const fullName = profileData ? `${profileData.firstName} ${profileData.lastName}`.trim() : 'کاربر داناک';
+    const fullName = profileData?.firstName ? `${profileData.firstName} ${profileData.lastName}`.trim() : `UDM-${profile?.data?.phone}`;
 
     const handleNotificationClick = (e: React.MouseEvent) => {
         e.preventDefault();