Magento2: Wysiwyg Editor Image Upload Doesn't Work Second Time

[bydrei]

Preconditions

1. Magento Version EE 2.1.5
2. Theme based of blank.

Steps to reproduce

1. Login to admin panel
2. Go to Content - Pages
3. Edit any page then click on "Show / Hide Editor" to go to the plain editor.
4. Click on Insert Image, let the GUI load, then click the X to close.
5. Click on Insert Image again (here you won't be able to open the popup again)

Expected result

1. You should be able to close and open as many times you want and need.

Actual result

1. Uncaught TypeError: Cannot read property 'closed' of undefined at Object.openDialog (browser.js:39) at HTMLButtonElement.onclick ((index):1)

[KevinGimbel]

Can confirm this is the case for Magento CE 2.1.6. It also does not work after inserting an image (e.g not closing the overlay with X).

I am also not able to switch to the WYSIWYG Editor from the plain editor.

[hostep]

This was already fixed on the develop branch almost a year ago, but wasn't being backported. So I did just that and created a backport for this fix to apply on Magento 2.1.x: https://github.com/magento/magento2/pull/9332 and it was approved!
I hope it will make its way into the next 2.1.x release :)

[vincentwinkel]

Hi,
I don't know if it's the same problem, but tested on several personal 2.0.14 install and testable on this 2.0.7 demo online : http://magento2.demo.ubertheme.com/admin (uber / uber123).
1) Create a new CMS page
2) Insert an image (open popup + choose an image + validate) : the popup is closed, the image is inserted
3) Insert a new image (open popup + choose an image + validate) : the popup is closed but the overlay is still here and no image is inserted

Do I need to create a new ticket ? I don't find solution neither similar ticket except this one.

[magento-engcom-team]

@ferrazzuk, thank you for your report.
The issue is already fixed in develop branch, 2.2.0, 2.1.9

[vincentwinkel]

What about magento 2.0 ?