added preliminary cookie mechanism for making documents appear after focusing on a document which sets a cookie. converted catalog to new "file system" tree view.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/client/views/collections/CollectionTreeView.tsx b/src/client/views/collections/CollectionTreeView.tsx
index 092606fdf..7beb76fdc 100644
--- a/src/client/views/collections/CollectionTreeView.tsx
+++ b/src/client/views/collections/CollectionTreeView.tsx
@@ -72,9 +72,9 @@ export class CollectionTreeView extends CollectionSubView<Document, Partial<coll
         SelectionManager.DeselectAll();
         if (result.length !== value.length) {
             const ind = targetDataDoc[this.props.fieldKey].indexOf(doc);
+            const prev = ind && targetDataDoc[this.props.fieldKey][ind - 1];
             targetDataDoc[this.props.fieldKey] = new List<Doc>(result);
             if (ind > 0) {
-                const prev = targetDataDoc[this.props.fieldKey][ind - 1];
                 FormattedTextBox.SelectOnLoad = prev[Id];
                 const prevView = DocumentManager.Instance.getDocumentView(prev, this.props.CollectionView);
                 prevView?.select(false);