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

Url: http://www.aequip.gr/skin.aspx?lang=el&itemtype=ProductCategory&itemid=00993336&action=view&00002328=055D4AFC‡055D4AA8‡055D4FD1‡055D4FDB‡055D4B1A‡055D513D‡055D4B24&splitter_products_offset=0
Message: Object reference not set to an instance of an object.
   at Ecommerce.PricelistUser.RetrieveUser(User user) in C:\Bone\Ecommerce\src\DBItems\PricelistUser\PricelistUser.cs:line 70
   at Ecommerce.ECOMMERCE.get_Pricelist() in C:\Bone\Ecommerce\src\Ecommerce.cs:line 463
   at Ecommerce.Product.get_ProductDiscount() in C:\Bone\Ecommerce\src\DBItems\Product\Product.cs:line 573
   at Ecommerce.Product.get_PriceNoVat() in C:\Bone\Ecommerce\src\DBItems\Product\Product.cs:line 590
   at Ecommerce.Product.get_Price() in C:\Bone\Ecommerce\src\DBItems\Product\Product.cs:line 626
   at ASP.tpl_tiles_product_tile_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\wwwroot\tpl\tiles\Product.tile.ascx:line 130
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at Bone.BONE.LoadControl(String virtual_path, DBItem item, Boolean cache, Boolean hide_debug_sign, Object[] objects, String default_if_file_no_exists) in C:\Bone\Bone\src\BONE.cs:line 3173
   at Bone.BONE.LoadControl(String virtual_path, DBItem item, Boolean cache, Object[] objects) in C:\Bone\Bone\src\BONE.cs:line 3032
   at Bone.DBItem.TileWithInfo(Object[] objects) in C:\Bone\Bone\src\EngineDB\DBItem.cs:line 1925
   at Bone.DBItem.get_Tile() in C:\Bone\Bone\src\EngineDB\DBItem.cs:line 1935
   at Bone.TilesetControl.<>c.b__39_0(Object x) in C:\Bone\Bone\src\EngineUI\UIControls\TilesetControl.cs:line 222
   at Bone.TilesetControl.Render(TextWriter w) in C:\Bone\Bone\src\EngineUI\UIControls\TilesetControl.cs:line 249
   at Bone.UIControl.ToString() in C:\Bone\Bone\src\EngineUI\_Control.cs:line 30
   at System.IO.TextWriter.Write(Object value)
   at ASP.tpl_productcategory_view_tpl_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\wwwroot\tpl\ProductCategory.View.tpl.ascx:line 667
   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 190
   at Bone.Action.RenderContent(TextWriter w) in C:\Bone\Bone\src\Actions\_Action.cs:line 412
   at Bone.Action.ToString() in C:\Bone\Bone\src\Actions\_Action.cs:line 582
   at Bone.Base.get_Content() in C:\Bone\Bone\src\Classes\Base.cs:line 81
   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)