diff --git a/src/Umbraco.Web.BackOffice/Controllers/PreviewController.cs b/src/Umbraco.Web.BackOffice/Controllers/PreviewController.cs
index 303ad44423..5f41682ee4 100644
--- a/src/Umbraco.Web.BackOffice/Controllers/PreviewController.cs
+++ b/src/Umbraco.Web.BackOffice/Controllers/PreviewController.cs
@@ -131,7 +131,7 @@ namespace Umbraco.Cms.Web.BackOffice.Controllers
             var user = _backofficeSecurityAccessor.BackOfficeSecurity?.CurrentUser;
             _cookieManager.SetCookieValue(Constants.Web.PreviewCookieName, "preview");
 
-            return null;
+            return new EmptyResult();
         }
 
         public ActionResult End(string? redir = null)