Choice Callback – UM class validation error

Dear Support,

I use the UM Form choice callback function defined in my functions.php in my registration form.

function return_choices(){
    $list = array(
        'one',
        'two',
        'three'
    );
    return $list;
}
add_action( 'init', 'return_choices' );

After submitting the form I get two errors in my console (both the same exept one is class-validation.php:81 and one class-validation.php:89)

content.js:43  E_NOTICE  Undefined index: form_id - /app/public/wp-content/plugins/ultimate-member/includes/core/class-validation.php:81 
#18 /app/public/wp-includes/class-wp-hook.php:286 - um\core\Validation->validate_fields_values(Array[12], Array[39])
#17 /app/public/wp-includes/plugin.php:208 - WP_Hook->apply_filters(Array[13], Array[2])
#16 /app/public/wp-content/plugins/ultimate-member/includes/core/class-user.php:1016 - apply_filters('um_before_save...', Array[13], Array[39])
#15 /app/public/wp-content/plugins/ultimate-member/includes/core/um-actions-register.php:59 - um\core\User->set_registration_details(Array[13], Array[39])
#14 /app/public/wp-includes/class-wp-hook.php:286 - um_after_insert_user(163, Array[39])
#13 /app/public/wp-includes/class-wp-hook.php:310 - WP_Hook->apply_filters('', Array[2])
#12 /app/public/wp-includes/plugin.php:465 - WP_Hook->do_action(Array[2])
#11 /app/public/wp-content/plugins/ultimate-member/includes/core/um-actions-register.php:452 - do_action('um_user_regist...', 163, Array[39])
#10 /app/public/wp-includes/class-wp-hook.php:286 - um_submit_form_register(Array[39])
#9 /app/public/wp-includes/class-wp-hook.php:310 - WP_Hook->apply_filters(NULL, Array[1])
#8 /app/public/wp-includes/plugin.php:465 - WP_Hook->do_action(Array[1])
#7 /app/public/wp-content/plugins/ultimate-member/includes/core/class-form.php:411 - do_action('um_submit_form...', Array[37])
#6 /app/public/wp-includes/class-wp-hook.php:286 - um\core\Form->form_init('')
#5 /app/public/wp-includes/class-wp-hook.php:310 - WP_Hook->apply_filters(false, Array[1])
#4 /app/public/wp-includes/plugin.php:465 - WP_Hook->do_action(Array[1])
#3 /app/public/wp-includes/template-loader.php:13 - do_action('template_redir...')
#2 /app/public/wp-blog-header.php:19 - require_once('/app/public/wp...')
#1 /app/public/index.php:17 - require('/app/public/wp...')

Everything works but the errors show up.
It looks like your code dont like choice callback options that are somehow not defined in wp_options table?
(class-validation.php – beginning line 76)

//validation of correct values from options in wp-admin
...
if ( in_array( $fields[ $key ]['type'], array( 'select' ) ) &&

Or is there anything I miss in my code?

Thank you!!

Regards,
Patrick