diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
index e760bb46..a6ea6f4a 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/effects.ts
@@ -9,7 +9,8 @@ import {
   map,
   withLatestFrom,
   switchMap,
-  tap
+  tap,
+  concatMap
 } from 'rxjs/operators';
 
 import { Store, select } from '@ngrx/store';
@@ -163,7 +164,7 @@ export class Effects {
         tap(() => {
           groupList = [];
         }),
-        exhaustMap(req => {
+        concatMap(req => {
           return this.syncProtocolService.group2(req).pipe(
             map(res => {
               switch (res.SSVC_TYPE) {
@@ -1082,7 +1083,7 @@ export class Effects {
           select((state: any) => state.messenger.sync.group2.syncDate as string)
         )
       ),
-      exhaustMap(([req, syncDate]) =>
+      concatMap(([req, syncDate]) =>
         this.groupProtocolService.update2(req).pipe(
           map((res: GroupUpdateResponse) => {
             return group2({