diff --git a/src/app/resume-page/collapsible-tree/collapsible-tree.component.html b/src/app/resume-page/collapsible-tree/collapsible-tree.component.html
index 9a904039..cb931408 100644
--- a/src/app/resume-page/collapsible-tree/collapsible-tree.component.html
+++ b/src/app/resume-page/collapsible-tree/collapsible-tree.component.html
@@ -25,7 +25,7 @@
 }
 @if (node.children.length) {
   <ul [attr.id]="childListId" [@expanded]="!isCollapsible || isExpanded">
-    @for (child of node.children; track child.data) {
+    @for (child of node.children; track child) {
       <li>
         <app-collapsible-tree
           [node]="child"