Server Error in '/' Application.

---

Line 7:  else
Line 8:  {
Line 9:      foreach (var hreflangLanguageVariant in Model.HreflangLanguageVariants)
Line 10:     {
Line 11:         var languageCode = !string.IsNullOrEmpty(hreflangLanguageVariant.LanguageCode) ? hreflangLanguageVariant.LanguageCode : "x-default";

[NullReferenceException: Object reference not set to an instance of an object.]
ASP._Page_Views_Partials__HreflangLink_cshtml.Execute() in c:\Servcorp\Hosting\servcorp.co.jp\https\Views\Partials\_HreflangLink.cshtml:9
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +251
System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +147
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +121
Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) +211
System.Web.Mvc.Html.RenderPartialExtensions.RenderPartial(HtmlHelper htmlHelper, String partialViewName, Object model) +108
ASP._Page_Views_Shared__Layout_cshtml.Execute() in c:\Servcorp\Hosting\servcorp.co.jp\https\Views\Shared\_Layout.cshtml:37
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +251
System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +147
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +121
System.Web.WebPages.<>c__DisplayClass3.<RenderPageCore>b__2(TextWriter writer) +308
System.Web.WebPages.WebPageBase.Write(HelperResult result) +107
System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) +88
System.Web.WebPages.WebPageBase.PopContext() +309
Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) +211
System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +383
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +96
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +843
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +843
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +843
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +81
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +188
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +38
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +73
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +52
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +39
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +52
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +73
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +431
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +158