WordPress database error Unknown column ‘r.ip_address’

Hello, using version 1.0.5. I’d like to programmatically execute ngsurvey shortcodes, so I do do_shortcode('[ngsurvey id="'.$id.'"]'). Logs show following error message:

WordPress database error Unknown column 'r.ip_address' in 'where clause' in statement SELECT r.id, r.created_by, r.created_date_gmt, r.finished_date_gmt FROM wp_ngs_responses r INNER JOIN wp_ngs_tracking t ON r.post_id = r.id AND t.post_type = 2 WHERE survey_id = 100539 AND r.ip_address = '111.55.55.222' by require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/sometemplate/single.php'), do_shortcode, preg_replace_callback, do_shortcode_tag, NgSurvey_CPT->handle_shortcode, NgSurvey_Controller_Survey->display, NgSurvey_Model_Responses->check_response

The SQL statement seems to not refer to t correctly, like it should be ON t.post_id = r.id and AND t.ip_address = instead. Correcting that in NgSurvey_Model_Responses->check_response makes the error go away.