From 52033e878856875fb300d3958cd693df40e81c51 Mon Sep 17 00:00:00 2001
From: Willow Gillingham <wgilling@asu.edu>
Date: Tue, 13 Jul 2021 21:57:39 +0000
Subject: [PATCH] check that there are audio textTracks before trying to use
 them for #1871

---
 modules/islandora_audio/js/audio.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/modules/islandora_audio/js/audio.js b/modules/islandora_audio/js/audio.js
index e7a57ea5..de0daec7 100644
--- a/modules/islandora_audio/js/audio.js
+++ b/modules/islandora_audio/js/audio.js
@@ -21,10 +21,12 @@
     function init(context,settings){
         if (!initialized){
             initialized = true;
-	    $('audio')[0].textTracks[0].oncuechange = function() {
-		var currentCue = this.activeCues[0].text;
-		$('#audioTrack').html(currentCue);
-	    }
+            if ($('audio')[0].textTracks.length > 0) {
+                $('audio')[0].textTracks[0].oncuechange = function() {
+                    var currentCue = this.activeCues[0].text;
+                    $('#audioTrack').html(currentCue);
+                }
+            }
         }
     }
     Drupal.Audio = Drupal.Audio || {};