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NullReferenceException in MvcSiteMapProvider at production

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The problem is I regularly get the error at the production site but can't reproduce this error locally (The version of MvcSiteMapProvider is 3.0). The text of exception is:

ExceptionType: System.NullReferenceException
Message: Object reference not set to an instance of an object.
StackTrace:
at System.Collections.Specialized.NameObjectCollectionBase.BaseGetAllKeys()
at System.Collections.Specialized.NameValueCollection.get_AllKeys()
at MvcSiteMapProvider.MvcSiteMapNode.get_MetaAttributes()
at MvcSiteMapProvider.Web.Html.SiteMapNodeModelMapper.MapToSiteMapNodeModel(SiteMapNode node, MvcSiteMapNode mvcNode, IDictionary2 sourceMetadata)
at MvcSiteMapProvider.Web.Html.SiteMapPathHelper.BuildModel(MvcSiteMapHtmlHelper helper, SiteMapNode startingNode)
at MvcSiteMapProvider.Web.Html.SiteMapPathHelper.SiteMapPath(MvcSiteMapHtmlHelper helper, String templateName)
at ASP._Page_Views_Shared__LoggedInLayout_cshtml.Execute() in c:\Solution\Sites\Project2Site\Views\Shared\_LoggedInLayout.cshtml:line 86
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
at System.Web.WebPages.WebPageBase.Write(HelperResult result)
at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action
1 body)
at System.Web.WebPages.WebPageBase.PopContext()
at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList
1 filters, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)

The place where I invoke SiteMapPath() method is:

@if (SiteMap.CurrentNode != null && SiteMap.CurrentNode.ParentNode != SiteMap.RootNode)
{
@Html.MvcSiteMap().SiteMapPath() // line 86
}

Thanks.

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