From a22adce069728ca811b81971c5d8d5185728f09c Mon Sep 17 00:00:00 2001
From: MIYAGI Hikaru <hcmiya@users.noreply.github.com>
Date: Fri, 6 Oct 2017 14:40:41 +0000
Subject: [PATCH] Fix error at emoji_compressed in Firefox ESR (#5241)

---
 app/javascript/mastodon/features/emoji/emoji_compressed.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/javascript/mastodon/features/emoji/emoji_compressed.js b/app/javascript/mastodon/features/emoji/emoji_compressed.js
index 3ed4dc82b9..3bd89cf3be 100644
--- a/app/javascript/mastodon/features/emoji/emoji_compressed.js
+++ b/app/javascript/mastodon/features/emoji/emoji_compressed.js
@@ -54,7 +54,9 @@ Object.keys(emojiMap).forEach(key => {
   if (typeof shortcode === 'undefined') {
     emojisWithoutShortCodes.push(filenameData);
   } else {
-    shortCodesToEmojiData[shortcode] = shortCodesToEmojiData[shortcode] || [[]];
+    if (!Array.isArray(shortCodesToEmojiData[shortcode])) {
+      shortCodesToEmojiData[shortcode] = [[]];
+    }
     shortCodesToEmojiData[shortcode][0].push(filenameData);
   }
 });