diff --git a/src/app/modules/admin/member/partner/compose/regist-compose.component.ts b/src/app/modules/admin/member/partner/compose/regist-compose.component.ts
index bd307dd..1b0f6bc 100644
--- a/src/app/modules/admin/member/partner/compose/regist-compose.component.ts
+++ b/src/app/modules/admin/member/partner/compose/regist-compose.component.ts
@@ -161,7 +161,7 @@ export class RegistComposeComponent implements OnInit {
     const site = new Site();
     const parentUsername = !!this.data.parent?.getUsername()
       ? this.data.parent?.getUsername()
-      : '';
+      : undefined;
     site.setId(siteId);
 
     member.setSiteId(siteId);
@@ -169,7 +169,10 @@ export class RegistComposeComponent implements OnInit {
     member.setPassword(password);
     member.setMemberClassId(this.data.classId);
     member.setMemberLevelId('c56231ac-2120-4a81-a30a-5d41fafb6c57');
-    member.setReferrerMemberUsername(parentUsername);
+    if (!!parentUsername) {
+      member.setReferrerMemberUsername(parentUsername);
+    }
+
     member.setNickname(nickname);
     member.setMobilePhoneNumber(mobilePhoneNumber);
     member.setBankAccount(bank_account);