get_terms returning empty array

Hi,

I’m having an issue with the get_terms() function.

If I use:

<?php
$terms = get_terms( 'location' );
print_r($terms);
?>

I get an array back:

Array ( [0] => stdClass Object ( [term_id] => 8 [name] => Aberdare [slug] => aberdare [term_group] => 0 [term_taxonomy_id] => 8 [taxonomy] => location [description] => [parent] => 7 [count] => 1 ) [1] => stdClass Object ( [term_id] => 10 [name] => Aberdeen [slug] => aberdeen [term_group] => 0 [term_taxonomy_id] => 10 [taxonomy] => location [description] => [parent] => 9 [count] => 14 ) [2] => stdClass Object ( [term_id] => 17 [name] => Aberdeenshire [slug] => aberdeenshire [term_group] => 0 [term_taxonomy_id] => 17 [taxonomy] => location [description] => [parent] => 9 [count] => 41 ) [3] => stdClass Object ( [term_id] => 1203 [name] => Aberdour [slug] => aberdour [term_group] => 0 [term_taxonomy_id] => 1203 [taxonomy] => location [description] => [parent] => 446 [count] => 1 );

But if I try and get the terms with the parent of of any number of child_of the array comes back empty.

<?php
$terms = get_terms( 'location', array('parent' => 9) );
print_r($terms);
?>

I get this:

Array ( )

Does any one know what i’m doing wrong?

Thanks
Pete