Qubely Plugin causing Gutenberg Editor to fail

With the Qubely plugin activated, it is not possible to edit some existing pages and get the following error
* “The editor has encountered an unexpected error.”

Once the Qubely plugin is deactivated, it is possible to edit the page. It is possible to create new pages even with the plug-in activated

This does not happen on all existing pages. I suspect it is something in the page that causes the problem.

I also experience the problem, with the Qubely plugin enabled, and after creating a new page, if I add a Qubely button, the moment I click the button icon to add the button, the editor returns the error message above. The existing pages with reporting the error on them all have buttons.

Wordpress WordPress 5.9 running Blocksy Child theme.