Hello Stiofan,
I have found the issue for some reason your $wpdb-prepare statement didn’t like the array on line 79 and 81 in /includes/helpers/forms.php
I took out the array and replaced it with comma separated values “‘account’, $extra_where” and now it works:
$fields = $wpdb->get_results( $wpdb->prepare( “SELECT * FROM ” . $table_name . ” WHERE form_type = ‘%s’ AND is_active = ‘1’ AND is_register_only_field = ‘0’ ” . $extra_where . ” ORDER BY sort_order ASC”, ‘account’, $extra_where ) );