array_key_exists ERROR updating to GS 3.2.1

[Carlos]

I have tried using getPageField with non-existing slugs and the error I get (a notice) is different.
After experimenting a bit, I got D.O.'s error by inserting this in the sidebar:

Code:

<?php
global $pagesArray;
$pagesArray = NULL;
getPageField('page','title');
?>

It's like $pagesArray isn't being populated or something in D.O.'s site.