From 98adb8e7841c08758e26d51278eb0c5cfc7af5c4 Mon Sep 17 00:00:00 2001
From: Albin Larsson <mail@albinlarsson.com>
Date: Tue, 6 Feb 2018 02:39:01 +0100
Subject: [PATCH] Fix harmless but annoying IE error 'IndexSizeError'

---
 src/js/captions.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/js/captions.js b/src/js/captions.js
index 847ef7ff..28ea266b 100644
--- a/src/js/captions.js
+++ b/src/js/captions.js
@@ -124,7 +124,8 @@ const captions = {
     setCue(input) {
         // Get the track from the event if needed
         const track = utils.is.event(input) ? input.target : input;
-        const active = track.activeCues[0];
+        const {activeCues} = track;
+        const active = activeCues.length && activeCues[0];
         const currentTrack = captions.getCurrentTrack.call(this);
 
         // Only display current track