Preview throws an error

I'm using Drupal 7.8 with Advanced Forums and the TinyMCE via wysiwig plugins.
When I go to preview a comment post, I get this error:

Warning: Invalid argument supplied for foreach() in include() (line 14 of ...\drupal\modules\dice_roller\dice-roller-results.tpl.php).

It doesn't matter whether the text I'm previewing includes any dice rolls or not. I get the error either way.

Site is running on PHP 5.3, MySQL 5, IIS 7.5.