Mailpoet2 crashes on block-editor.php

Hi,
I’m adding a new newsletter using Mailpoet2 that I used in the last 2 years without issues.
Today, I cloned a previous newsletter (to keep my format and so on).
When I try to insert a wordpress article, I get a popup with the following error:

“Fatal error: Call to a member function is_block_editor() on null in /home/fmanclos/public_html/wp-content/plugins/edit-flow/modules/custom-status/compat/block-editor.php on line 16”

Any hint?
I’m working with WordPress 5.0.3 (Writers theme).

Thanks in advance
Ferruccio

The page I need help with: [log in to see the link]