bubasuma\simplechat\db\Conversation::populateRecord PHP Method

    public static function populateRecord($record, $row)
    {
        foreach (['user_id', 'contact_id'] as $name) {
            if (isset($row[$name])) {
                $row[$name] = intval($row[$name]);
            }
        }
        parent::populateRecord($record, $row);
    }