Multiple Errors When Trying to Add user_email field

I am trying to allow a user to edit their user_email field in the WordPress wp_users table.

1. I create a Custom Fields object with a text field with the id of user_email (to match the column name in wp_users.
2. I load the page with the form, the field is not filled.
3. I input an email and submit I get the following errors:

Warning: Illegal string offset 'user_id' in /wp-content/plugins/mb-user-profile/inc/forms/class-mb-user-profile-form.php on line 108

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/mb-user-profile/inc/forms/class-mb-user-profile-form.php:108) in /wp-content/plugins/mb-user-profile/inc/shortcodes/class-mb-user-profile-shortcode.php on line 74

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/mb-user-profile/inc/forms/class-mb-user-profile-form.php:108) in /wp-includes/pluggable.php on line 1219

I am using the standalone plugin, not the extension via AIO.