To reproduce:
- Open the attached project.
- Unselect Column3 from the list.

Workaround:
this.radVirtualGrid1.MasterViewInfo.CustomColumns.RemoveAt(0);

foreach (VirtualGridRowElement rowElement in
    this.radVirtualGrid1.VirtualGridElement.TableElement.GetDescendants(delegate(RadElement x) { return x is VirtualGridRowElement; }, TreeTraversalMode.BreadthFirst))
{
    rowElement.CellContainer.Children.Clear();
}