admin.php?page=sitepress-multilingual-cms/menu/languages.php:177 Uncaught DOMException: Failed to execute 'replaceState' on 'History': A history state object with URL 'hidden link' cannot be created in a document with origin 'hidden link' and URL 'hidden link'.
at hidden link
Simply the plugin attempt to make an ajax request using HTTP on the HTTPS site. However, I already found a way to workaround.
By executing this script in the console can solve the problem in both step 4 and 5