Surplus quote mark when ordering by RAND

[eluser]darrenm[/eluser]
I think I've found a bug

Code:

$this->CI->db->order_by('track','random');
$query = $this->CI->db->get('tracks');

produces a db error with SQL output of:

Code:

SELECT * FROM (`tracks`) ORDER BY ` RAND()

That little quote mark in front of RAND() shouldn't be there.

Also, I shouldn't really have to specify a field name to get random ordering.