Error in backen, items with checkboxlists

Hi,

We have a page with a pargraph that is an Item. This item has a number of fields of type "Checkbox list". These lists are poulated with Items from a "Repository"-page.

After we upgraded to DW 9 this page stopped working (both in frontend and in backend.)

This is the stack trace i get in backend. It seems that it fails when populating some of the Checkboxlists.

[NullReferenceException: Object reference not set to an instance of an object.]
   Dynamicweb.Content.Items.Queries.Repository.SelectByParentPageIds(IEnumerable`1 parentIds, Query query, Boolean includeParagraphs, Boolean includeChildItems, Boolean checkPermissions, Boolean includeInheritedItems) +484
   Dynamicweb.Content.Items.Queries.Repository.SelectByParentPageId(IEnumerable`1 pids, Query query, Boolean includeParagraphs, Boolean includeAllChildItems, Boolean checkPermissions, Boolean includeInheritedItems) +33
   Dynamicweb.Content.Items.Queries.Repository.SelectByParentPageIds(IEnumerable`1 parentIds, Query query, Boolean includeParagraphs, Boolean includeChildItems, Boolean checkPermissions) +30
   Dynamicweb.Content.Items.Queries.Repository.SelectByParentPageId(IEnumerable`1 pids, Query query, Boolean includeParagraphs, Boolean includeAllChildItems, Boolean checkPermissions) +28
   Dynamicweb.Content.Items.Queries.Repository.SelectByParentPageId(Int32 pageId, Query query, Boolean includeParagraphs, Boolean includeAllChildItems, Boolean checkPermissions) +80
   Dynamicweb.Content.Items.Metadata.FieldOptionMetadataItemSource.GetData(Int32 currentSourceId) +238
   Dynamicweb.Content.Items.Metadata.FieldOptionMetadataItemSource.get_Values() +64
   Dynamicweb.Content.Items.Metadata.FieldOptionSetupMetadata.get_Values() +21
   Dynamicweb.Content.Items.Editors.EditForm.FromItem(String parentSystemName, ItemType itemMeta, ItemEntry item, EditFormRenderer renderer) +2143
   Dynamicweb.Admin.ParagraphEdit.Page_PreRender(Object sender, EventArgs e) +930
   System.Web.UI.Control.OnPreRender(EventArgs e) +9674194
   System.Web.UI.Control.PreRenderRecursiveInternal() +88
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +883

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Error in backen, items with checkboxlists

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