From aedd1f453247002fc056aecf05c8d12018e321ed Mon Sep 17 00:00:00 2001
From: Artur Arseniev <artur.catch@hotmail.it>
Date: Tue, 16 Jun 2020 20:43:27 +0200
Subject: [PATCH] Put a check in getFrameOffset

---
 src/canvas/view/CanvasView.js | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/canvas/view/CanvasView.js b/src/canvas/view/CanvasView.js
index cb7d8a1c0..4dc75f765 100644
--- a/src/canvas/view/CanvasView.js
+++ b/src/canvas/view/CanvasView.js
@@ -180,10 +180,9 @@ export default Backbone.View.extend({
    */
   getFrameOffset(el) {
     if (!this.frmOff || el) {
-      const frEl = el
-        ? el.ownerDocument.defaultView.frameElement
-        : this.frame.el;
-      this.frmOff = this.offset(frEl);
+      const frame = this.frame.el;
+      const frEl = el ? el.ownerDocument.defaultView.frameElement : frame;
+      this.frmOff = this.offset(frEl || frame);
     }
     return this.frmOff;
   },