Catch database exception

I found in system/Database/MySQLi/Connection.php:329 this code:

PHP Code:

        try
        {
            return $this->connID->query($this->prepQuery($sql));
        }
        catch (\mysqli_sql_exception $e)
        {
            log_message('error', $e);
            if ($this->DBDebug)
            {
                throw $e;
            }
        } 


Maybe I'm wrong but, if we have DBDebug sets true then we shouldn't call log_message? So I mean that log_message should be inside else. What do you think?