Console error wp-tinymce.js

Hello,
I see these errors in console when I try click “visual editor” on my product page.

Failed to load resource: the server responded with a status of 400 ()
load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,jquery-ui-widget,jquery-ui-core,jquery-ui-mouse,jquery-ui-sortable,underscore,backbone,wp-util,&load[]=wp-backbone,media-models,moxiejs,plupload&ver=5.2.2:8 JQMIGRATE: Migrate is installed, version 1.4.1
9wp-tinymce.js:3 Uncaught TypeError: Cannot read property 'onpageload' of undefined
    at wp-tinymce.js:3
    at e (wp-tinymce.js:3)
    at Te.b.bind (wp-tinymce.js:3)
    at Object.F [as bind] (wp-tinymce.js:3)
    at Object.init (wp-tinymce.js:3)
    at e (editor.min.js:1)
    at HTMLDocument.<anonymous> (editor.min.js:1)
    at C (wp-tinymce.js:3)
    at HTMLDocument.d (wp-tinymce.js:3)
css:1 Failed to load resource: the server responded with a status of 400 ()

It happens even when plugin is disabled.