I have a REST API which works just as expected as long as I first visit a page after an application recycle.

If I recycle the application and hit the API first I get an exception when trying to access the Url property on a IPublishedContent.

 Url = '((Umbraco.Web.Models.PublishedContentBase)typedContent).Url' threw an exception of type 'System.InvalidOperationException'

I load the content with _umbracoHelper.TypedContent(contentId) and instantiate _umbracoContext with the following code:

var umbracoContext = UmbracoContext.Current;

        if (umbracoContext == null)
        {
            var httpContext = new HttpContextWrapper(HttpContext.Current);

            UmbracoContext.EnsureContext(
                httpContext,
                ApplicationContext.Current,
                new WebSecurity(httpContext, ApplicationContext.Current),
                UmbracoConfig.For.UmbracoSettings(),
                UrlProviderResolver.Current.Providers,
                false);
        }

        _umbracoHelper = new UmbracoHelper(umbracoContext);

What am I missing?