diff --git a/lib/static/modules/reducers/tree/index.js b/lib/static/modules/reducers/tree/index.js
index cbe8c36cf..5c39f554d 100644
--- a/lib/static/modules/reducers/tree/index.js
+++ b/lib/static/modules/reducers/tree/index.js
@@ -1,4 +1,4 @@
-import {findLast} from 'lodash';
+import {findLast, isEmpty} from 'lodash';
 import {produce} from 'immer';
 import actionNames from '../../action-names';
 import {