From 171c2e927b0dff8343b20d9272d10f1592c8d739 Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Sun, 19 Mar 2017 06:57:48 +0000
Subject: event.key is not always defined

Fixes #2453.
---
 lib/keyboard_utils.coffee | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/keyboard_utils.coffee')

diff --git a/lib/keyboard_utils.coffee b/lib/keyboard_utils.coffee
index c49fb3f4..22f37fb3 100644
--- a/lib/keyboard_utils.coffee
+++ b/lib/keyboard_utils.coffee
@@ -43,6 +43,9 @@ KeyboardUtils =
   getKeyCharUsingKey: (event) ->
     if event.keyCode of @keyNames
       @keyNames[event.keyCode]
+    # It appears that event.key is not always defined (see #2453).
+    else if not event.key?
+      ""
     else if event.key.length == 1
       event.key
     else if event.key.length == 2 and "F1" <= event.key <= "F9"
-- 
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