TypeError: window.tinyMCE.get(…) is null

I am getting the following error when trying to edit a WordPress page in visual editor on http://www.domaine-audubert.com.

 TypeError: window.tinyMCE.get(...) is null


 window.tinyMCE.get( current_id ).setContent( content, {format: 'html'} );

The error seems to be located in wp-content/plugins/fusion-core/admin/page-builder/assets/js/js-wp-editor.js?ver=1.8.1 (line 173 col 7)

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In that column I can find this code:

            $(self).before('<link rel="stylesheet" id="editor-buttons-css" href="' + fusionb_vars.includes_url + 'css/editor.css" type="text/css" media="all">');

            $(self).before(wrap);
            $(self).remove();

            new QTags(current_id);
            QTags._buttonsInit();
            switchEditors.go(current_id, options.mode);

            if( content && options.mode == 'tmce' ) {
                setTimeout( function() {
                    window.tinyMCE.get( current_id ).setContent( content, {format: 'html'} );
                }, 1000);
            }

            $(wrap).on( 'click', '.insert-media', function( event ) {
                var elem = $( event.currentTarget ),
                    editor = elem.data('editor'),
                    options = {
                        frame:  'post',
                        state:  'insert',
                        title:  wp.media.view.l10n.addMedia,
                        multiple: true
                    };

                event.preventDefault();

                elem.blur();

                if ( elem.hasClass( 'gallery' ) ) {
                    options.state = 'gallery';
                    options.title = wp.media.view.l10n.createGalleryTitle;
                }

                wp.media.editor.open( editor, options );
                //hide insert from URL
                $('.media-menu a:contains(Insert from URL)').remove();
            });

        }
    });
}

})( jQuery, window )

But I have no idea where the error comes from. Is this a common problem and what can I do about it?

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