Error message: Object reference not set to an instance of an object.

Url: http://aequip.gr/skin.aspx?lang=el&itemtype=ProductCategory&itemid=00990CA7&action=view&00002328=055D4A8D‡055D4DFD‡055D4B24‡055D4AA5&0098E88A=0098E8E7&009936AC=009936DA&pagesize=48&sortby=priceasc&splitter_products_offset=0

Message: Object reference not set to an instance of an object.

   at ASP.tpl_productcategory_view_tpl_ascx.<>c__DisplayClass10.<__Render__control1>b__2(TagOption o) in c:\inetpub\wwwroot\tpl\ProductCategory.View.tpl.ascx:line 273
   at Bone.DBList`1.FindAll(Predicate`1 match) in C:\Bone\Bone\src\EngineDB\DBList.cs:line 105
   at ASP.tpl_productcategory_view_tpl_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\wwwroot\tpl\ProductCategory.View.tpl.ascx:line 273
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at Bone.ActionView.Render(TextWriter w) in C:\Bone\Bone\src\Actions\DBActions\ActionView.cs:line 161
   at Bone.Action.RenderContent(TextWriter w) in C:\Bone\Bone\src\Actions\_Action.cs:line 394
   at Bone.Action.ToString() in C:\Bone\Bone\src\Actions\_Action.cs:line 518
   at Bone.Base.get_Content() in C:\Bone\Bone\src\Classes\Base.cs:line 80
   at ASP.skin_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\wwwroot\skin.aspx:line 324
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Page.Render(HtmlTextWriter writer)
   at Bone.Asp.RenderSkin(TextWriter w) in C:\Bone\Bone\src\Classes\Asp.cs:line 71
   at Bone.ModalAction.RenderPage(TextWriter w) in C:\Bone\Bone\src\Actions\Modal.cs:line 81
   at Bone.Asp.Render(HtmlTextWriter w) in C:\Bone\Bone\src\Classes\Asp.cs:line 82
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)