mysql forbidden field name in WHERE clause ?

[eluser]symbol.software[/eluser]
[quote author="überfuzz" date="1253304517"]Try to echo the variable before and after the query.[/quote]

I have printed everything and works perfect. I am 7 years in PHP development & I have more than just basic understanding of PHP code.

This works:

Code:

$query = $this->db->get_where('users', array('asdfasdf'=>'jon', 'password'=>'password'));

But this is generating the sql wrong:

Code:

$query = $this->db->get_where('users', array('username'=>'jon', 'password'=>'password'));

It works with any string excepting 'username' string.

I am digging into the database library to see what the hell is happening.