From 816fbd3abda5e4a13af5ede7f2f6d9ed398c89b7 Mon Sep 17 00:00:00 2001
From: Andrew Thornton <art27@cantab.net>
Date: Mon, 30 Dec 2019 11:21:16 +0000
Subject: [PATCH] In SimpleMDE check if trigger exists before call

---
 web_src/js/index.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/web_src/js/index.js b/web_src/js/index.js
index 395a01f05939d..f4f08b828c8c4 100644
--- a/web_src/js/index.js
+++ b/web_src/js/index.js
@@ -1490,7 +1490,9 @@ function setCommentSimpleMDE($editArea) {
       }
     },
     Backspace: (cm) => {
-      cm.getInputField().trigger('input');
+      if (cm.getInputField().trigger) {
+        cm.getInputField().trigger('input');
+      }
       cm.execCommand('delCharBefore');
     }
   });