Prevent errors in getFrameOffset

5 years ago · 8b7a6f9291
1 changed files with 2 additions and 1 deletions
--- a/src/canvas/view/CanvasView.js
+++ b/src/canvas/view/CanvasView.js
@ -201,7 +201,8 @@ export default Backbone.View.extend({
  getFrameOffset(el) {
    if (!this.frmOff || el) {
      const frame = this.frame.el;
-      const frEl = el ? el.ownerDocument.defaultView.frameElement : frame;
+      const winEl = el && el.ownerDocument.defaultView;
+      const frEl = winEl ? winEl.frameElement : frame;
      this.frmOff = this.offset(frEl || frame);
    }
    return this.frmOff;