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<?php
add_action('init', 'ninja_forms_register_display_hidden_fields');
function ninja_forms_register_display_hidden_fields(){
    add_action('ninja_forms_display_after_open_form_tag', 'ninja_forms_display_hidden_fields');
}

function ninja_forms_display_hidden_fields($form_id){
    global $ninja_forms_processing;
    ?>
    <input type="hidden" name="_ninja_forms_display_submit" value="1">
    <input type="hidden" name="_form_id"  id="_form_id" value="<?php echo $form_id;?>">
    <?php
    if( is_object( $ninja_forms_processing) AND $ninja_forms_processing->get_all_errors()){
        ?>
        <input type="hidden" id="ninja_forms_processing_error" value="1">
        <?php
    }
}