WordPress 5 WP Ultimate Recipe Fix

recipe_form.js

function WpUltimateRecipeGutenbergEditorLoaded() {
        return ( wp.data !== undefined && wp.data.select( 'core/editor' ) !== undefined );
    } 

// TODO WordPress 5.0 Gutenberg fix. Get rid once fixed in core.
if (WpUltimateRecipeGutenbergEditorLoaded() && window.tinymce) {
    wp.data.subscribe(function () {
        // the post is currently being saved && we have tinymce editors
        if (wp.data.select( 'core/editor' ).isSavingPost() && window.tinymce.editors) {
            for (var i = 0; i < tinymce.editors.length; i++) {
                tinymce.editors[i].save();
            }
        }
    });
}