How to fix “Supplied nav_menu_item value missing property” after update to WordPress 5.0

I have an update on this. I discovered that if a menu item has ACF fields assigned to it and you delete a menu item, it causes this error in the Customizer. It seems as if the menu item delete functions are leaving ACF data behind in the database which is causing this. I have reached out to ACF support regarding the issue.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)