--- uc_bank_transfer.old.module	2011-03-14 11:38:37.000000000 +0200
+++ uc_bank_transfer.module	2011-04-04 19:04:48.276075001 +0200
@@ -260,7 +260,7 @@ function uc_bank_transfer_bank_details($
   if (variable_get('uc_bank_transfer_account_branch', '') <> '') {
     $bank_info[] = t('Branch office') . ': ' . variable_get('uc_bank_transfer_account_branch', '');
   }
-  if (variable_get('uc_bank_transfer_subject_oid', FALSE)) {
+  if (variable_get('uc_bank_transfer_subject_oid', FALSE) && $oid > 0) {
     isset($bank_info) ? ($bank_info[] = '<br />' . t('Reason for payment') . ': ' . t('order number') . ' ' . $oid) : ($bank_info[] = t('Reason for payment') . ': ' . t('order number') . ' ' . $oid);
   }
   if (variable_get('uc_bank_transfer_policy', '') <> '') {