diff --git a/src/app/routes/ticket-management/components/invoice-requested/invoice-requested.component.ts b/src/app/routes/ticket-management/components/invoice-requested/invoice-requested.component.ts
index 99377d53..c9f22479 100644
--- a/src/app/routes/ticket-management/components/invoice-requested/invoice-requested.component.ts
+++ b/src/app/routes/ticket-management/components/invoice-requested/invoice-requested.component.ts
@@ -43,8 +43,8 @@ export class InvoiceRequestedComponent implements OnInit {
       Object.assign(requestOptions.body, {
         ...this.sf.value,
         createTime: {
-          start: this.sf?.value?.createTime?.[0] || null,
-          end: this.sf?.value?.createTime?.[1] || null
+          start: this.sf?.value?.createTime?.[0] || '',
+          end: this.sf?.value?.createTime?.[1] || ''
         }
       });
     }