diff --git a/ui-ngx/src/app/shared/models/websocket/notification-ws.models.ts b/ui-ngx/src/app/shared/models/websocket/notification-ws.models.ts
index da876d0d3f..0acbba1139 100644
--- a/ui-ngx/src/app/shared/models/websocket/notification-ws.models.ts
+++ b/ui-ngx/src/app/shared/models/websocket/notification-ws.models.ts
@@ -16,7 +16,7 @@
 
 import { BehaviorSubject, ReplaySubject } from 'rxjs';
 import { CmdUpdate, CmdUpdateMsg, CmdUpdateType, WebsocketCmd } from '@shared/models/telemetry/telemetry.models';
-import { first, map } from 'rxjs/operators';
+import { map } from 'rxjs/operators';
 import { NgZone } from '@angular/core';
 import { isDefinedAndNotNull } from '@core/utils';
 import { Notification } from '@shared/models/notification.models';
@@ -47,12 +47,19 @@ export class NotificationsUpdate extends CmdUpdate {
 
 export class NotificationSubscriber extends WsSubscriber {
   private notificationCountSubject = new ReplaySubject<NotificationCountUpdate>(1);
-  private notificationsSubject = new BehaviorSubject<NotificationsUpdate>(null);
+  private notificationsSubject = new BehaviorSubject<NotificationsUpdate>({
+    cmdId: 0,
+    cmdUpdateType: undefined,
+    errorCode: 0,
+    errorMsg: '',
+    notifications: [],
+    totalUnreadCount: 0
+  });
 
   public messageLimit = 10;
 
   public notificationCount$ = this.notificationCountSubject.asObservable().pipe(map(msg => msg.totalUnreadCount));
-  public notifications$ = this.notificationsSubject.asObservable().pipe(map(msg => msg?.notifications || []));
+  public notifications$ = this.notificationsSubject.asObservable().pipe(map(msg => msg.notifications ));
 
   public static createNotificationCountSubscription(notificationWsService: NotificationWebsocketService,
                                                     zone: NgZone): NotificationSubscriber {
@@ -109,35 +116,27 @@ export class NotificationSubscriber extends WsSubscriber {
   }
 
   onNotificationsUpdate(message: NotificationsUpdate) {
-    this.notificationsSubject.asObservable().pipe(
-      first()
-    ).subscribe((value) => {
-      let saveMessage;
-      if (isDefinedAndNotNull(value) && message.update) {
-        const findIndex = value.notifications.findIndex(item => item.id.id === message.update.id.id);
-        if (findIndex !== -1) {
-          value.notifications.push(message.update);
-          value.notifications.sort((a, b) => b.createdTime - a.createdTime);
-          if (value.notifications.length > this.messageLimit) {
-            value.notifications.pop();
-          }
+    const currentNotifications = this.notificationsSubject.value;
+    let processMessage = message;
+    if (isDefinedAndNotNull(currentNotifications) && message.update) {
+      currentNotifications.notifications.unshift(message.update);
+      if (currentNotifications.notifications.length > this.messageLimit) {
+        currentNotifications.notifications.pop();
+      }
+      processMessage = currentNotifications;
+      processMessage.totalUnreadCount = message.totalUnreadCount;
+    }
+    if (this.zone) {
+      this.zone.run(
+        () => {
+          this.notificationsSubject.next(processMessage);
+          this.notificationCountSubject.next(processMessage);
         }
-        saveMessage = value;
-      } else {
-        saveMessage = message;
-      }
-      if (this.zone) {
-        this.zone.run(
-          () => {
-            this.notificationsSubject.next(saveMessage);
-            this.notificationCountSubject.next(saveMessage);
-          }
-        );
-      } else {
-        this.notificationsSubject.next(saveMessage);
-        this.notificationCountSubject.next(saveMessage);
-      }
-    });
+      );
+    } else {
+      this.notificationsSubject.next(processMessage);
+      this.notificationCountSubject.next(processMessage);
+    }
   }
 }