Recently I ran into a problem with WordPress built-in WYSIWYG visual editor. The problem was I get a totally blank page at visual tab but when switched to Text(HTML) tab everything is working, Also, the toolbar is not rendering.

After doing some extensive research I tried disabling plugins, using google libraries, reinstalling the theme and even downgrading WordPress. Nothing fixed my issue. The only thing I have changed recently is enabling Letsencrypt on my server.

This is how I fixed