When an Advanced Custom Fields (ACF) field group is defined both in the database and using the local JSON feature, the settings in the local JSON file always take precedence (except in the case of viewing the definition in the WP Admin screen).
Advanced Custom Fields
ACF Uncaught TypeError: Cannot read property ‘id’ of undefined
Recently I was working on a site using Advanced Custom Fields (ACF) and the field input boxes had stopped working. In the browser console, I saw the error “ACF Uncaught TypeError: Cannot read property ‘id’ of undefined”.