X-Git-Url: https://git.arvados.org/arvados-workbench2.git/blobdiff_plain/f8fb6725beec5b2bf0eec7f375d49f9189ff1bc3..efb6e397a2d9ec98c8a9fa1f47bea66d8651bb81:/src/models/tree.ts

diff --git a/src/models/tree.ts b/src/models/tree.ts
index c7713cbc..e9291388 100644
--- a/src/models/tree.ts
+++ b/src/models/tree.ts
@@ -74,6 +74,7 @@ export const setNodeValueWith = <T>(mapFn: (value: T) => T) => (id: string) => (
 export const mapTreeValues = <T, R>(mapFn: (value: T) => R) => (tree: Tree<T>): Tree<R> =>
     getNodeDescendantsIds('')(tree)
         .map(id => getNode(id)(tree))
+        .filter(node => !!node)
         .map(mapNodeValue(mapFn))
         .reduce((newTree, node) => setNode(node)(newTree), createTree<R>());