From 9ba2d11cd5148caea99747b977827b9400a7058d Mon Sep 17 00:00:00 2001
From: yflory <yann.flory@xwiki.com>
Date: Fri, 17 Apr 2020 16:50:41 +0200
Subject: [PATCH] Guard against a type error

---
 www/code/markers.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/www/code/markers.js b/www/code/markers.js
index 9ce7de56a..5fd6fe068 100644
--- a/www/code/markers.js
+++ b/www/code/markers.js
@@ -478,7 +478,7 @@ define([
             // Remove marks that are placed under this one
             try {
                 Env.editor.findMarks(from, to).forEach(function (mark) {
-                    if (mark.attributes['data-type'] !== 'authormark') { return; }
+                    if (!mark || !mark.attributes || mark.attributes['data-type'] !== 'authormark') { return; }
                     mark.clear();
                 });
             } catch (e) {