Post images not showing on page 2.

Hi,

I noticed today that when I go to page 2 on my index page the post images do not show up, assuming this is due to them attempting to get images from a path that does not exist. I use the below code to grab images from posts, however should I be using an alternative method?

src="<?php $thumb = get_post_custom_values('post-image'); echo $thumb[0]; >"

Thanks!