diff --git a/frontend/client-portal/src/pages/AlarmCenter/List.tsx b/frontend/client-portal/src/pages/AlarmCenter/List.tsx
index 48bde926..a2c9e7f3 100644
--- a/frontend/client-portal/src/pages/AlarmCenter/List.tsx
+++ b/frontend/client-portal/src/pages/AlarmCenter/List.tsx
@@ -298,8 +298,8 @@ export default function List() {
       setData(
         response.data.data.map((obj: any) => ({
           ...obj,
-          start_date: <Label>{fDateSuffix(obj.start_date)}</Label>,
-          end_date: <Label> {fDateSuffix(obj.end_date)}</Label>,
+          start_date: <Label>{obj.start_date ? fDateSuffix(obj.start_date) : '-'}</Label>,
+          end_date: <Label> {obj.end_date ? fDateSuffix(obj.end_date) : '-'}</Label>,
           action: (
             <TableMoreMenu
             actions={