diff --git a/src/blackgui/guiapplication.cpp b/src/blackgui/guiapplication.cpp
index 561f69a93..c21195756 100644
--- a/src/blackgui/guiapplication.cpp
+++ b/src/blackgui/guiapplication.cpp
@@ -523,20 +523,31 @@ namespace BlackGui
 
     bool CGuiApplication::displayInOverlayWindow(const CStatusMessage &message, int timeOutMs)
     {
+        if (message.isEmpty()) { return false; }
         IMainWindowAccess *m = mainWindowAccess();
         BLACK_VERIFY_X(m, Q_FUNC_INFO, "No access interface");
-        if (!m) { return false; }
+        if (!m) { return IMainWindowAccess::displayInOverlayWindow(message, timeOutMs); }
         return m->displayInOverlayWindow(message, timeOutMs);
     }
 
     bool CGuiApplication::displayInOverlayWindow(const CStatusMessageList &messages, int timeOutMs)
     {
+        if (messages.isEmpty()) { return false; }
         IMainWindowAccess *m = mainWindowAccess();
         BLACK_VERIFY_X(m, Q_FUNC_INFO, "No access interface");
-        if (!m) { return false; }
+        if (!m) { return IMainWindowAccess::displayInOverlayWindow(messages, timeOutMs); }
         return m->displayInOverlayWindow(messages, timeOutMs);
     }
 
+    bool CGuiApplication::displayInOverlayWindow(const QString &html, int timeOutMs)
+    {
+        if (html.isEmpty()) { return false; }
+        IMainWindowAccess *m = mainWindowAccess();
+        BLACK_VERIFY_X(m, Q_FUNC_INFO, "No access interface");
+        if (!m) { return IMainWindowAccess::displayInOverlayWindow(html, timeOutMs); }
+        return m->displayInOverlayWindow(html, timeOutMs);
+    }
+
     bool CGuiApplication::displayTextInConsole(const QString &text)
     {
         IMainWindowAccess *m = mainWindowAccess();
diff --git a/src/blackgui/guiapplication.h b/src/blackgui/guiapplication.h
index 9e91eb8e0..e1d346bc7 100644
--- a/src/blackgui/guiapplication.h
+++ b/src/blackgui/guiapplication.h
@@ -71,7 +71,7 @@ namespace BlackGui
      */
     class BLACKGUI_EXPORT CGuiApplication :
         public BlackCore::CApplication,
-        public BlackGui::IMainWindowAccess
+        public IMainWindowAccess
     {
         Q_OBJECT
         Q_INTERFACES(BlackGui::IMainWindowAccess)
@@ -132,6 +132,7 @@ namespace BlackGui
         virtual bool displayTextInConsole(const QString &text) override;
         virtual bool displayInOverlayWindow(const BlackMisc::CStatusMessage &message, int timeOutMs = -1) override;
         virtual bool displayInOverlayWindow(const BlackMisc::CStatusMessageList &messages, int timeOutMs = -1) override;
+        virtual bool displayInOverlayWindow(const QString &html, int timeOutMs = -1) override;
         //! @}
 
         // -------- Splash screen related ---------