From ef55598822273d39fdae496e1f3d3d89a1eb3483 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bar=C4=B1=C5=9F=20Soner=20U=C5=9Fakl=C4=B1?=
 <baris@nodebb.org>
Date: Wed, 26 Sep 2018 21:30:29 -0400
Subject: [PATCH] filter messages that are already inserted to DOM

---
 public/src/client/chats.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/public/src/client/chats.js b/public/src/client/chats.js
index 77dbab488a..dac32dd4d5 100644
--- a/public/src/client/chats.js
+++ b/public/src/client/chats.js
@@ -121,6 +121,12 @@ define('forum/chats', [
 				if (!data) {
 					return;
 				}
+				data = data.filter(function (chatMsg) {
+					return !$('[component="chat/message"][data-mid="' + chatMsg.messageId + '"]').length;
+				});
+				if (!data.length) {
+					return;
+				}
 				messages.parseMessage(data, function (html) {
 					var currentScrollTop = el.scrollTop();
 					var previousHeight = el[0].scrollHeight;