CI_DB_driver Bug?

There is this one settings in database.php config file:

Code:

'autoinit' => TRUE,

Documentaion says:

Code:

autoinit    Whether or not to automatically connect to the database when the library loads. If set to false, the

connection will take place prior to executing the first query.

I thought lets try this, may be this will help me with the case but instead i got this:

Code:

A PHP Error was encountered

Severity: Error

Message: Call to a member function real_escape_string() on a non-object

Filename: mysqli/mysqli_driver.php

Line Number: 335

Backtrace: