From efc3f5aabaf0d5bef4086b3644648c4e41d7e223 Mon Sep 17 00:00:00 2001
From: Brett Zamir <brettz9@yahoo.com>
Date: Mon, 25 Jun 2018 13:26:13 +0800
Subject: [PATCH] - Avoid erring during resize on encountering MathML (which
 have no `style`)

---
 editor/svgcanvas.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/editor/svgcanvas.js b/editor/svgcanvas.js
index c331b0c2..03bb6001 100644
--- a/editor/svgcanvas.js
+++ b/editor/svgcanvas.js
@@ -1390,6 +1390,9 @@ const mouseDown = function (evt) {
         const all = mouseTarget.getElementsByTagName('*'),
           len = all.length;
         for (i = 0; i < len; i++) {
+          if (!all[i].style) { // mathML
+            continue;
+          }
           all[i].style.vectorEffect = 'non-scaling-stroke';
           if (iswebkit) { delayedStroke(all[i]); }
         }