Krumo死亡之屏

I'm trying to use Krumo on a PHP script I'm debugging, but I'm getting a white screen of death when I actually call Krumo.

Here's what my code looks like. As far as I can tell, I'm following the instructions to install and use Krumo properly...

<?php ini_set('include_path', '/krumo/');?>

<?php krumo($invoice); ?>

For reference, I've confirmed that $invoice array has data. If I do a var_dump of it, I can crawl the data fine. I'd just prefer to use Krumo.