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System.NullReferenceException: Object reference not set to an instance of an object.
   at Umbraco.Cms.Core.Models.PublishedContent.PublishedContentType..ctor(IContentTypeComposition contentType, IPublishedContentTypeFactory factory)
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.<>c__DisplayClass15_0.<GetContentTypesByAlias>b__0() in C:\home\site\repository\src\Our.Umbraco.DocTypeGridEditor\Helpers\DocTypeGridEditorHelper.cs:line 193
   at Umbraco.Extensions.AppCacheExtensions.<>c__DisplayClass5_0`1.<GetCacheItem>b__0()
   at Umbraco.Cms.Core.Cache.SafeLazy.<>c__DisplayClass1_0.<GetSafeLazy>b__0()
--- End of stack trace from previous location ---
   at Umbraco.Cms.Core.Cache.ObjectCacheAppCache.Get(String key, Func`1 factory, Nullable`1 timeout, Boolean isSliding, String[] dependentFiles)
   at Umbraco.Cms.Core.Cache.ObjectCacheAppCache.Get(String key, Func`1 factory)
   at Umbraco.Cms.Core.Cache.DeepCloneAppCache.Get(String key, Func`1 factory)
   at Umbraco.Extensions.AppCacheExtensions.GetCacheItem[T](IAppCache provider, String cacheKey, Func`1 getCacheItem)
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.GetContentTypesByAlias(String contentTypeAlias) in C:\home\site\repository\src\Our.Umbraco.DocTypeGridEditor\Helpers\DocTypeGridEditorHelper.cs:line 188
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.ConvertValue(String id, String contentTypeAlias, String dataJson) in C:\home\site\repository\src\Our.Umbraco.DocTypeGridEditor\Helpers\DocTypeGridEditorHelper.cs:line 173
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.RenderDocTypeGridEditorItem(IViewComponentHelper helper, IHtmlHelper htmlHelper, Object model) in C:\home\site\repository\src\Our.Umbraco.DocTypeGridEditor\Helpers\DocTypeGridEditorHelper.cs:line 212
   at AspNetCore.App_Plugins_DocTypeGridEditor_Render_DocTypeGridEditor.ExecuteAsync() in C:\home\site\wwwroot\App_Plugins\DocTypeGridEditor\Render\DocTypeGridEditor.cshtml:line 4
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.HtmlHelper.RenderPartialCoreAsync(String partialViewName, Object model, ViewDataDictionary viewData, TextWriter writer)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.HtmlHelper.PartialAsync(String partialViewName, Object model, ViewDataDictionary viewData)
   at AspNetCore.Views_Partials_grid_editors_base.ExecuteAsync() in C:\home\site\wwwroot\Views\Partials\grid\editors\base.cshtml:line 11