diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.ts
index 57779f26..bbd7ddcb 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/left-sidenav/organization.component.ts
@@ -195,7 +195,8 @@ export class OrganizationComponent implements OnInit, OnDestroy {
   /** 전체 체크여부 */
   getCheckedAllUser() {
     if (
-      this.selectedDepartmentUserInfoList &&
+      !this.selectedDepartmentUserInfoList ||
+      this.selectedDepartmentUserInfoList.length === 0 ||
       this.selectedDepartmentUserInfoList.filter(
         item =>
           !(