<?php if ($field_filefield) { ?> Results with 1 even if the field is empty

I've been using filefield+imagefield to add an image gallery to nodes. Here is the template code for teasers;

<?php if ($field_gallery) { ?>
<div class="gallery-teaser">
This node has an image gallery.
</div>
<?php }; ?>

I can see that line even if those fields are empty. Since I only updated filefield module from the date it was working OK. I'm thinking it's a bug about filefield module.