TypeError: Cannot read properties of null (reading 'previousElementSibling')

[ChavitiSathish]

On Uploading Image without focus on Textarea, application is breaking with error Cannot read properties of null (reading 'previousElementSibling')

On Uploading a image if we try to upload the second image the spinner keeps on spinner as uploadhandler is kept on waiting for response.

To Reproduce
Steps to reproduce the behavior:

Go to http://suneditor.com/sample/index.html
Remove focus from editor
Click on image button
In modal, select image, then click submit

For Second Issue
Upload an Image,
Try to upload another image with focusout

Expected behavior
image should appear in textarea