diff --git a/frontend/src/ts/account_applications/component/button/dto/Account.ts b/frontend/src/ts/account_applications/component/button/dto/Account.ts
index aa6360e3..184b8753 100644
--- a/frontend/src/ts/account_applications/component/button/dto/Account.ts
+++ b/frontend/src/ts/account_applications/component/button/dto/Account.ts
@@ -1,8 +1,8 @@
 export class Account {
-  public start: string = "";
+  public start: string = null;
   public appointment: string = "";
   public idDomain: string = "";
-  public finish: string = "";
+  public finish: string = null;
   public sessionsLimit: number = 0;
   public idPerson: string = "";
 }
diff --git a/frontend/src/ts/account_applications/component/button/dto/Role.ts b/frontend/src/ts/account_applications/component/button/dto/Role.ts
index 4f6bc7ea..fc30fe66 100644
--- a/frontend/src/ts/account_applications/component/button/dto/Role.ts
+++ b/frontend/src/ts/account_applications/component/button/dto/Role.ts
@@ -1,4 +1,4 @@
 export class Role {
   public id: string;
-  public finish: string = "";
+  public finish: string = null;
 }