diff --git a/apps/red-ui/src/app/modules/pdf-viewer/services/webviewer-loaded.guard.ts b/apps/red-ui/src/app/modules/pdf-viewer/services/webviewer-loaded.guard.ts
index b0934ac21..9ce46809e 100644
--- a/apps/red-ui/src/app/modules/pdf-viewer/services/webviewer-loaded.guard.ts
+++ b/apps/red-ui/src/app/modules/pdf-viewer/services/webviewer-loaded.guard.ts
@@ -28,6 +28,6 @@ export class WebViewerLoadedGuard implements CanActivate {
         this._documentViewer.init(instance.Core.documentViewer);
         this._viewerHeaderService.init();
 
-        return true;
+        return !!this._pdf.instance;
     }
 }