feat: add add new config strategy to frontend

backend/src/auth/guard/isAdmin.guard.ts

@@ -5,6 +5,7 @@ import { User } from "@prisma/client";
 export class AdministratorGuard implements CanActivate {
   canActivate(context: ExecutionContext): boolean {
     const { user }: { user: User } = context.switchToHttp().getRequest();
+    if (!user) return false;
     return user.isAdministrator;
   }
 }