diff --git a/src/components/shelf/NodeName.vue b/src/components/shelf/NodeName.vue
index def6e3e..01b8623 100644
--- a/src/components/shelf/NodeName.vue
+++ b/src/components/shelf/NodeName.vue
@@ -23,7 +23,7 @@ export default class NodeName extends Vue {
   ) => any;
 
   get someChildrenVisible(): boolean {
-    return this.node.children.some((child) => child.show);
+    return this.node.children?.some((child) => child.show);
   }
 
   get haveLeftPadding(): boolean {
diff --git a/src/components/shelf/NodeToggle.vue b/src/components/shelf/NodeToggle.vue
index bc76b0b..0941707 100644
--- a/src/components/shelf/NodeToggle.vue
+++ b/src/components/shelf/NodeToggle.vue
@@ -16,7 +16,7 @@ export default class NodeToggle extends Vue {
   @Prop({ required: true }) node!: NodeType;
 
   get someChildrenVisible(): boolean {
-    return this.node.children.some((child) => child.show);
+    return this.node.children?.some((child) => child.show);
   }
 
   toggleChildren() {