I'm facing an issue on the backend side of my Joomla 3.9. I'm using K2 as the content builder and set TinyMCE as default editor. I wanted to insert an image by using the modal button "image", but, as I'm in the popup window and I select an image, neither the "insert" button nor the exit one works.
Particularly I got this error:
Uncaught TypeError: window.parent.jInsertEditorText is not a function at Object.onok (popup-imagemanager.min.js?4a006a4cdc5a805)
Does anyone know how to fix it?