Server Error in '/' Application.

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Line 384:							try
Line 385:							{
Line 386:								row = rows.OrderByDescending(item => item["AliasCulture"]) /* Seřadíme podle AliasCulture, aby invariant byl až na konci */
Line 387:									.ThenBy(item => item["AliasPriority"]) /* dál podle priority, která je při nejmenším zmatečná. */
Line 388:									.FirstOrDefault(item => ((string)item["AliasCulture"]).Equals(CMS.CMSHelper.CMSContext.PreferredCultureCode, StringComparison.InvariantCultureIgnoreCase)

[ArgumentException: Object must be of type String.]
   System.String.CompareTo(Object value) +164
   System.Linq.EnumerableSorter`2.CompareKeys(Int32 index1, Int32 index2) +123
   System.Linq.EnumerableSorter`1.QuickSort(Int32[] map, Int32 left, Int32 right) +157
   System.Linq.EnumerableSorter`1.Sort(TElement[] elements, Int32 count) +135
   System.Linq.<GetEnumerator>d__1.MoveNext() +185
   System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source, Func`2 predicate) +124
   Havit.Navigation.ListMenu.GetItems(Int32 parentNodeId, Int32 indentLevel) in c:\Havit\BontiaWeb\App_Code\Havit\Navigation\ListMenu.cs:386

[ApplicationException: Node ID: 2062, 
	<ul id="menuElem">
		<li>]
   Havit.Navigation.ListMenu.GetItems(Int32 parentNodeId, Int32 indentLevel) in c:\Havit\BontiaWeb\App_Code\Havit\Navigation\ListMenu.cs:393
   Havit.Navigation.ListMenu.ReloadData(Boolean forceLoad) in c:\Havit\BontiaWeb\App_Code\Havit\Navigation\ListMenu.cs:607
   Havit.Navigation.ListMenu.OnInit(EventArgs e) in c:\Havit\BontiaWeb\App_Code\Havit\Navigation\ListMenu.cs:554
   System.Web.UI.Control.InitRecursive(Control namingContainer) +454
   System.Web.UI.Control.InitRecursive(Control namingContainer) +219
   System.Web.UI.Control.InitRecursive(Control namingContainer) +219
   System.Web.UI.Control.InitRecursive(Control namingContainer) +219
   System.Web.UI.Control.InitRecursive(Control namingContainer) +219
   System.Web.UI.Control.InitRecursive(Control namingContainer) +219
   System.Web.UI.Control.InitRecursive(Control namingContainer) +219
   System.Web.UI.Control.InitRecursive(Control namingContainer) +219
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1719