From e1ba21bf3e7cd13cb4e0a62a86492a2af4ba5599 Mon Sep 17 00:00:00 2001
From: Michael Prentice <splaktar@gmail.com>
Date: Mon, 8 Feb 2021 11:27:30 -0500
Subject: [PATCH] fix(toc): quickly switching to API tab can throw exceptions
 (#913)

Fixes #909
---
 .../src/app/shared/table-of-contents/table-of-contents.html | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/material.angular.io/material.angular.io/material.angular.io/material.angular.io/material.angular.io/src/app/shared/table-of-contents/table-of-contents.html b/material.angular.io/material.angular.io/material.angular.io/material.angular.io/material.angular.io/src/app/shared/table-of-contents/table-of-contents.html
index 06ba5d880dd3..518dd8ee6e6d 100644
--- a/material.angular.io/material.angular.io/material.angular.io/material.angular.io/material.angular.io/src/app/shared/table-of-contents/table-of-contents.html
+++ b/material.angular.io/material.angular.io/material.angular.io/material.angular.io/material.angular.io/src/app/shared/table-of-contents/table-of-contents.html
@@ -1,8 +1,8 @@
 <div *ngFor="let linkSection of _linkSections" class="docs-toc-container">
-  <div class="docs-toc-heading">{{linkSection.name}}</div>
-  <nav [attr.aria-label]="linkSection.name + ' Table of Contents'">
+  <div class="docs-toc-heading">{{linkSection?.name}}</div>
+  <nav [attr.aria-label]="linkSection?.name + ' Table of Contents'">
     <a [href]="_rootUrl + '#' + link.id"
-      *ngFor="let link of linkSection.links; let i = index"
+      *ngFor="let link of linkSection?.links; let i = index"
       class="docs-level-{{link.type}} docs-link"
       [class.docs-active]="link.active">
       {{link.name}}