Notice: Object of class WP_User could not be converted

Hi, I will save your time and give you copy/past soluion for this!

Inside wp-user-avatar/includes/class-wp-user-avatar-shortcode.php, inside public function wpua_edit_shortcode replace this

$valid_user = current_user_can('edit_user', $get_user) ? $get_user : null;

to this

$valid_user = current_user_can('edit_user', $get_user->ID) ? $get_user : null;

Also, capability edit_user need to be edit_users or include both of them.

Have a nice work and we waiting new update!

Thanks! ??