Possible exception when loading content in batch

Description

When browsing certain content, it is possible to get this exception:

[NullReferenceException: Object reference not set to an instance of an object.]
Mediachase.MetaDataPlus.Internal.<DoLoad>d__10.MoveNext() +1567
System.Linq.Enumerable.ToDictionary(IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer) +292
EPiServer.Commerce.Catalog.Provider.Construction.MetaDataContentBuilder.GetMetaObjects(IDictionary`2 metaObjectIdsByClassId, String language) +466
EPiServer.Commerce.Catalog.Provider.Construction.NodeBuilder.ConstructNodes(CatalogNodeDto nodeDto, IDictionary`2 versionForUnpublishedContent, String language) +760
EPiServer.Commerce.Catalog.Provider.CatalogContentLoader.ConstructContent(IList`1 contentLinks, Func`3 createContentFunc) +499
EPiServer.Commerce.Catalog.Provider.CatalogContentLoader.LoadSpecificContentInstances(IList`1 contentLinks, String language) +592
EPiServer.Commerce.Catalog.Provider.CatalogContentProvider.BatchLoad(IList`1 contentLinks, Func`2 dbLoader) +234
EPiServer.Commerce.Catalog.Provider.CatalogContentProvider.LoadContents(IList`1 contentReferences, ILanguageSelector selector) +720
EPiServer.Core.ContentProvider.GetContentBatch(IList`1 batch, ILanguageSelector selector, List`1& contents, Dictionary`2& contentMap) +133
EPiServer.Core.ContentProvider.GetScatteredContents(IEnumerable`1 contentLinks, ILanguageSelector selector) +1005
EPiServer.Core.Internal.ProviderPipelineImplementation.GetItems(ContentProvider provider, IList`1 contentLinks, LoaderOptions loaderOptions) +308
EPiServer.Core.Internal.DefaultContentLoader.GetItems(IEnumerable`1 contentLinks, LoaderOptions loaderOptions) +650
EPiServer.Commerce.Shell.Rest.Query.<GetItemsBatched>d__3.MoveNext() +399
System.Linq.Enumerable.Any(IEnumerable`1 source) +87
EPiServer.Cms.Shell.UI.Rest.ContentQuery.Internal.DefaultContentQueryHelper.FilterAccess(IEnumerable`1 items, AccessLevel requiredAccess) +56
EPiServer.Cms.Shell.UI.Rest.ContentQuery.ContentQueryBase.Filter(IEnumerable`1 items, ContentQueryParameters parameters) +94
EPiServer.Commerce.Shell.Rest.Query.GetChildrenQuery.Filter(IEnumerable`1 items, ContentQueryParameters parameters) +121
EPiServer.Cms.Shell.UI.Rest.ContentQuery.ContentQueryBase.ExecuteQuery(IQueryParameters parameters) +65
EPiServer.Cms.Shell.UI.Rest.Internal.ContentStore.Get(ContentReference id, String query, ContentReference referenceId, ContentReference[] references, String[] typeIdentifiers, Nullable`1 allLanguages, IEnumerable`1 sortColumns, ItemRange range) +440