diff --git a/src/components/ReviewRecall.vue b/src/components/ReviewRecall.vue
index 33cb8a1..87b2ffb 100644
--- a/src/components/ReviewRecall.vue
+++ b/src/components/ReviewRecall.vue
@@ -139,7 +139,7 @@ const findNodeByPath = (node: MindMapTreeNode, path: string): MindMapTreeNode |
   let current: MindMapTreeNode | null = node;
   for (let i = 0; i < parts.length && current; i++) {
     if (current.title === parts[i] && i === parts.length - 1) return current;
-    const child = (current.children || []).find((c) => c.title === parts[i]);
+    const child: MindMapTreeNode | undefined = (current.children || []).find((c) => c.title === parts[i]);
     current = child || null;
   }
   return null;