From a6865ec61bf3372d0ec89b83a3145ee80549157d Mon Sep 17 00:00:00 2001
From: Michael Prentice <splaktar@gmail.com>
Date: Sat, 24 Oct 2020 22:21:03 -0400
Subject: [PATCH] fix(input): check that containerCtrl.label is defined before
 accessing it

Fixes #10831
---
 src/components/input/input.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/components/input/input.js b/src/components/input/input.js
index b29da30c97..5554f17e5c 100644
--- a/src/components/input/input.js
+++ b/src/components/input/input.js
@@ -474,9 +474,11 @@ function inputTextareaDirective($mdUtil, $window, $mdAria, $timeout, $mdGesture)
     function setupAttributeWatchers() {
       if (containerCtrl.label) {
         attr.$observe('required', function (value) {
-          // We don't need to parse the required value, it's always a boolean because of angular's
+          // We don't need to parse the required value, it's always a boolean because of AngularJS'
           // required directive.
-          containerCtrl.label.toggleClass('md-required', value && !mdNoAsterisk);
+          if (containerCtrl.label) {
+            containerCtrl.label.toggleClass('md-required', value && !mdNoAsterisk);
+          }
         });
       }
     }