diff --git a/AxonIvyPortal/portal/src/ch/addon/portal/generic/menu/MenuView.java b/AxonIvyPortal/portal/src/ch/addon/portal/generic/menu/MenuView.java
index e56ded8a3a..59f81315b5 100644
--- a/AxonIvyPortal/portal/src/ch/addon/portal/generic/menu/MenuView.java
+++ b/AxonIvyPortal/portal/src/ch/addon/portal/generic/menu/MenuView.java
@@ -268,7 +268,7 @@ public PortalDashboardItemWrapper getDashboardCache() {
     }
 
     if (portalDashboardItemWrapper == null) {
-      synchronized (PortalDashboardItemWrapper.class) {
+      synchronized (this) {
         portalDashboardItemWrapper = new PortalDashboardItemWrapper(DashboardUtils.collectDashboards());
         cacheService.setSessionCache(IvyCacheIdentifier.PORTAL_DASHBOARDS, sessionUserId, portalDashboardItemWrapper);
       }
diff --git a/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/util/DashboardUtils.java b/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/util/DashboardUtils.java
index 7fc57b2b58..c8dd6cdf6b 100644
--- a/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/util/DashboardUtils.java
+++ b/AxonIvyPortal/portal/src/ch/ivy/addon/portalkit/util/DashboardUtils.java
@@ -66,7 +66,7 @@ public static List<Dashboard> getPublicDashboards() {
     }
 
     if (portalPublicDashboardWrapper == null) {
-      synchronized (PortalPublicDashboardWrapper.class) {
+      synchronized (sessionUserId.intern()) {
         List<Dashboard> dashboards = new ArrayList<>();
         try {
           String dashboardJson = Ivy.var().get(PortalVariable.DASHBOARD.key);
@@ -100,7 +100,7 @@ public static List<Dashboard> getPrivateDashboards() {
     }
 
     if (portalPrivateDashboardWrapper == null) {
-      synchronized (PortalPublicDashboardWrapper.class) {
+      synchronized (sessionUserId.intern()) {
         List<Dashboard> dashboards = new ArrayList<>();
         try {
           String dashboardInUserProperty = readDashboardBySessionUser();