improve

src/app/services/events.service.ts

@@ -305,6 +305,28 @@ export class EventsService {
       } else {
         this.hasAnyCalendar = true
       }
+
+
+      (() => {
+        const keys = {}
+
+        for (let e of SessionStore.user.OwnerCalendars) {
+          if(!keys[e.CalendarId]) {
+            keys[e.CalendarId] = e.CalendarId
+          } else {
+            throw(`Calendar ${e.CalendarId} is repeated for user `+ SessionStore.user.FullName);
+          }
+        }
+
+        for (let e of SessionStore.user.SharedCalendars) {
+          if(!keys[e.CalendarId]) {
+            keys[e.CalendarId] = e.CalendarId
+          } else {
+            throw(`Calendar ${e.CalendarId} is repeated for user `+ SessionStore.user.FullName);
+          }
+        }
+      })();
+      
     }
   }