diff --git a/src/Umbraco.Web/HtmlHelperRenderExtensions.cs b/src/Umbraco.Web/HtmlHelperRenderExtensions.cs
index 0c8a529ea1..cec5267497 100644
--- a/src/Umbraco.Web/HtmlHelperRenderExtensions.cs
+++ b/src/Umbraco.Web/HtmlHelperRenderExtensions.cs
@@ -112,7 +112,7 @@ namespace Umbraco.Web
 														  viewContext.HttpContext.Server.UrlEncode(surfaceAction),
 														  area);
 
-				var additionalRouteValsAsQuery = additionalRouteVals.ToDictionary<object>().ToQueryString();
+				var additionalRouteValsAsQuery = additionalRouteVals != null ? additionalRouteVals.ToDictionary<object>().ToQueryString() : null;
 
 				if (!additionalRouteValsAsQuery.IsNullOrWhiteSpace())
 					surfaceRouteParams += "&" + additionalRouteValsAsQuery;