Where's Rexy

System.NullReferenceException: Object reference not set to an instance of an object.
   at ASP._Page_views_partials_grid_stacks_editors_CustomImage_cshtml.Execute() in D:\Sites\break-charity.org-restore\views\partials\grid\stacks\editors\CustomImage.cshtml:line 13
   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 Umbraco.Web.Mvc.ProfilingView.Render(ViewContext viewContext, TextWriter writer) in d:\a\1\s\src\Umbraco.Web\Mvc\ProfilingView.cs:line 25
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at ASP._Page_Views_Partials_grid_editors_Base_cshtml.Execute() in D:\Sites\break-charity.org-restore\Views\Partials\grid\editors\Base.cshtml:line 20