--- a/contemplate.module	2012-09-01 12:32:32.000000000 -0400
+++ a/contemplate.module	2012-09-03 16:08:39.000000000 -0400
@@ -840,7 +840,7 @@
  * Eval the RSS enclosure field
  */
 function contemplate_eval_enclosure($field, $node) {
-  $tmplt = '<?php print '. $field .' ?>';
+  $tmplt = '<?php if (isset(' . $field . ')) print '. $field .' ?>';
   $xml_elements = array();
   $fid = contemplate_eval($tmplt, $node, $xml_elements);
   if (is_numeric($fid)) {