How To Fix “TypeError: Language code” JavaScript Errors in WordPress

Published Date Author: , Posted January 20th, 2020 at 8:08:13am

Wordpress site broken with Javascript errors with zero plugins or themes installed.
The issue followed different devices, OS’es and different browsers.

User account corrupted.
The wp_usermeta locale field had an invalid value of “regular”, and nulling the field solved the issue.

JS console shows this:

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