--- uc_fee/uc_fee.module.orig	2010-12-20 17:46:22.000000000 -0500
+++ uc_fee/uc_fee.module	2010-12-20 18:10:00.000000000 -0500
@@ -589,7 +589,7 @@ function uc_fee_javascript() {
  * Theme functions.
  */
 function theme_uc_fee_price($fee) {
-  $fee_price = is_null($fee->default_price) ? $fee->price : $fee->default_price;
+  $fee_price = (float)$fee->price ? $fee->price : $fee->default_price;
   return $fee->type == UC_FEE_TYPE_ABSOLUTE? uc_currency_format($fee_price) : $fee_price.'%';
 }