=== modified file 'uc_store/uc_store.module'
--- uc_store/uc_store.module	2009-02-12 20:45:25 +0000
+++ uc_store/uc_store.module	2009-02-13 08:04:25 +0000
@@ -794,6 +794,10 @@
  * Format an amount for display with the store's currency settings.
  */
 function uc_currency_format($value, $sign = TRUE, $thou = TRUE, $dec = NULL) {
+  if ($value === NULL) {
+    return 'N/A';
+  }
+  
   if (variable_get('uc_currency_prec', 2) > 0) {
     if (abs($value) < '.'. str_repeat('0', variable_get('uc_currency_prec', 2) - 1) .'1') {
       $value = 0;