From 1b37a5bbd9d9f964b1d0ccfd0a50677db9eab38b Mon Sep 17 00:00:00 2001
From: Greg Kempe <greg@kempe.net>
Date: Mon, 16 Sep 2024 17:29:45 +0200
Subject: [PATCH] tolerate TOC tree with no items

fixes #1988
---
 peachjam/js/components/taxonomy-tree.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/peachjam/js/components/taxonomy-tree.ts b/peachjam/js/components/taxonomy-tree.ts
index 07b6fc1da..50c4d9d8b 100644
--- a/peachjam/js/components/taxonomy-tree.ts
+++ b/peachjam/js/components/taxonomy-tree.ts
@@ -27,7 +27,7 @@ class TaxonomyTree {
     }
 
     tocController.expanded = expanded;
-    tocController.items = data[0].children.map((item: TOCItemType) => formatItem(item));
+    tocController.items = data.length ? data[0].children.map((item: TOCItemType) => formatItem(item)) : [];
     tocController.expandAllBtnText = i18next.t('Expand all');
     tocController.collapseAllBtnText = i18next.t('Collapse all');
     tocController.titleFilterPlaceholder = i18next.t('Search');