diff --git a/AxonIvyPortal/portal/cms/cms.yaml b/AxonIvyPortal/portal/cms/cms.yaml
index 896f00b727..865c4f9a30 100644
--- a/AxonIvyPortal/portal/cms/cms.yaml
+++ b/AxonIvyPortal/portal/cms/cms.yaml
@@ -1,6 +1,6 @@
 ch.ivy.addon.portal.generic:
   CaseDetailsTemplate:
-    noCaseId: No case-Id specified
+    noCaseFound: Case not found or you don't have permission to view this case.
     requestTabTitle: Request
     statusTabTitle: Case Information
   OpenTaskTemplate:
diff --git a/AxonIvyPortal/portal/cms/cms_de.yaml b/AxonIvyPortal/portal/cms/cms_de.yaml
index d1f85cba9f..0267078871 100644
--- a/AxonIvyPortal/portal/cms/cms_de.yaml
+++ b/AxonIvyPortal/portal/cms/cms_de.yaml
@@ -1,6 +1,6 @@
 ch.ivy.addon.portal.generic:
   CaseDetailsTemplate:
-    noCaseId: Keine Vorgangs-ID spezifiziert
+    noCaseFound: Fall nicht gefunden oder Sie haben keine Berechtigung, diesen Fall zu sehen.
     requestTabTitle: Anfrage
     statusTabTitle: Vorgangsinformationen
   OpenTaskTemplate:
diff --git a/AxonIvyPortal/portal/cms/cms_en.yaml b/AxonIvyPortal/portal/cms/cms_en.yaml
index edcfc633ea..aee201428b 100644
--- a/AxonIvyPortal/portal/cms/cms_en.yaml
+++ b/AxonIvyPortal/portal/cms/cms_en.yaml
@@ -1,6 +1,6 @@
 ch.ivy.addon.portal.generic:
   CaseDetailsTemplate:
-    noCaseId: No case-Id specified
+    noCaseFound: Case not found or you don't have permission to view this case.
     requestTabTitle: Request
     statusTabTitle: Case Information
   OpenTaskTemplate:
diff --git a/AxonIvyPortal/portal/cms/cms_es.yaml b/AxonIvyPortal/portal/cms/cms_es.yaml
index 5f54bd1989..f74b3738de 100644
--- a/AxonIvyPortal/portal/cms/cms_es.yaml
+++ b/AxonIvyPortal/portal/cms/cms_es.yaml
@@ -1,6 +1,6 @@
 ch.ivy.addon.portal.generic:
   CaseDetailsTemplate:
-    noCaseId: No hay ID de caso especificado
+    noCaseFound: Caso no encontrado o no tienes permiso para ver este caso.
     requestTabTitle: Solicitud
     statusTabTitle: Información del caso
   OpenTaskTemplate:
diff --git a/AxonIvyPortal/portal/cms/cms_fr.yaml b/AxonIvyPortal/portal/cms/cms_fr.yaml
index cad0ec2d68..5341943639 100644
--- a/AxonIvyPortal/portal/cms/cms_fr.yaml
+++ b/AxonIvyPortal/portal/cms/cms_fr.yaml
@@ -1,6 +1,6 @@
 ch.ivy.addon.portal.generic:
   CaseDetailsTemplate:
-    noCaseId: Aucun numéro de dossier n'a été indiqué
+    noCaseFound: Cas non trouvé ou vous n'avez pas la permission de voir ce cas.
     requestTabTitle: Demande
     statusTabTitle: Informations sur le dossier
   OpenTaskTemplate:
diff --git a/AxonIvyPortal/portal/src/ch/ivy/addon/portal/generic/bean/AbstractTaskTemplateBean.java b/AxonIvyPortal/portal/src/ch/ivy/addon/portal/generic/bean/AbstractTaskTemplateBean.java
index 5fbf065d0b..d02d42b241 100644
--- a/AxonIvyPortal/portal/src/ch/ivy/addon/portal/generic/bean/AbstractTaskTemplateBean.java
+++ b/AxonIvyPortal/portal/src/ch/ivy/addon/portal/generic/bean/AbstractTaskTemplateBean.java
@@ -159,7 +159,7 @@ private int getFirstTerminatingStageIndex(List<IStage> stages) {
   }
 
   public void generateCaseDetailInFrame(ICase currentCase) {
-    setCaseDetailsLink(PortalNavigator.buildPortalCaseDetailInFrameUrl(currentCase.uuid()));
+    setCaseDetailsLink(PortalNavigator.buildPortalCaseDetailInFrameUrl(currentCase != null ? currentCase.uuid() : null));
   }
 
   public Long getIntervalForPollingWhenOpenCaseDetails() {
diff --git a/AxonIvyPortal/portal/webContent/layouts/restricted/AbstractTaskTemplate.xhtml b/AxonIvyPortal/portal/webContent/layouts/restricted/AbstractTaskTemplate.xhtml
index 21f9cc4a85..402dd8c7b4 100644
--- a/AxonIvyPortal/portal/webContent/layouts/restricted/AbstractTaskTemplate.xhtml
+++ b/AxonIvyPortal/portal/webContent/layouts/restricted/AbstractTaskTemplate.xhtml
@@ -160,14 +160,14 @@
             </h:panelGroup>
           </f:facet>
           <ui:insert name="caseDetails">
-            <h:outputText value="#{ivy.cms.co('/ch.ivy.addon.portal.generic/CaseDetailsTemplate/noCaseId')}"
-              rendered="#{caseWidgetBean.isHiddenCase(case)}" />
-            <h:panelGroup id="case-details-panel" layout="block" rendered="#{!caseWidgetBean.isHiddenCase(case)}"
+            <h:outputText value="#{ivy.cms.co('/ch.ivy.addon.portal.generic/CaseDetailsTemplate/noCaseFound')}"
+              rendered="#{caseWidgetBean.isHiddenCase(case)} or case eq null}" styleClass="no-case-found" />
+            <h:panelGroup id="case-details-panel" layout="block" rendered="#{!caseWidgetBean.isHiddenCase(case) and case ne null}"
               styleClass="case-default-widget-container case-details case-details-panel">
               <div class="ui-g js-iframe-container">
                 <div class="ui-g-12 u-padding-0">
                   <iframe id="i-frame-case-details" src="#{taskTemplateBean.caseDetailsLink}"
-                    onload="setupHeightForIFrame();" class="case-information-frame  js-iFrame-case-details"
+                    onload="setupHeightForIFrame();" class="case-information-frame js-iFrame-case-details"
                     scrolling="no" frameborder="0"
                     title="#{ivy.cms.co('/Dialogs/com/axonivy/portal/layouts/AbstractTaskTemplate/CaseDetailsIFrameTitle')}" />
                 </div>
diff --git a/AxonIvyPortal/portal/webContent/resources/css/module.css b/AxonIvyPortal/portal/webContent/resources/css/module.css
index 986b50e687..a34b1eaf45 100644
--- a/AxonIvyPortal/portal/webContent/resources/css/module.css
+++ b/AxonIvyPortal/portal/webContent/resources/css/module.css
@@ -716,6 +716,11 @@ span.case-details-document-add-link, span.task-details-document-add-link {
   align-self: center;
 }
 
+.no-case-found {
+  margin-left: 21px;
+  font-size: var(--large-font-size);
+}
+
 .case-detail-section-title-container {
   display: flex;
 }