Uncaught TypeError: Cannot read properties of null (reading 'addEventListener')

[vasdaris]

Older version was ok but after an upgrade Block (Assistant mode) is displayed without being able to post messages.

Console log is the following (ver 3.0.0) :

first.js:3689 Uncaught TypeError: Cannot read properties of null (reading 'addEventListener')
at _exports.init (first.js:3689:1197)
at index.php:1608:99
at Object.execCb (require.min.js:5:12861)
at b.check (require.min.js:5:6615)
at b.enable (require.min.js:5:9363)
at b.init (require.min.js:5:5721)
at require.min.js:5:11235