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<?php
add_action('init', 'ninja_forms_register_edit_field_custom_class');
function ninja_forms_register_edit_field_custom_class(){
    add_action('ninja_forms_edit_field_after_registered', 'ninja_forms_edit_field_custom_class', 10);
}

function ninja_forms_edit_field_custom_class($field_id){
    global $ninja_forms_fields;
    $field_row = ninja_forms_get_field_by_id($field_id);
    $field_type = $field_row['type'];
    $field_data = $field_row['data'];
    $reg_field = $ninja_forms_fields[$field_type];
    $edit_custom_class = $reg_field['edit_custom_class'];
    if($edit_custom_class){
        if(isset($field_data['class'])){
            $class = $field_data['class'];
        }else{
            $class = '';
        }

        ninja_forms_edit_field_el_output($field_id, 'text', __( 'Custom CSS Classes', 'ninja-forms' ), 'class', $class, 'thin', '', 'widefat');
    }
}