Index: simplenews.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/simplenews/simplenews.module,v
retrieving revision 1.162
diff -u -p -r1.162 simplenews.module
--- simplenews.module	29 Nov 2008 09:46:35 -0000	1.162
+++ simplenews.module	2 Dec 2008 19:49:59 -0000
@@ -1539,7 +1539,7 @@ function simplenews_mail($key, &$message
       // Check if this node-language pair has been buffered.
       // If not, build the message and store it for later use.
       if (!isset($messages[$nid][$langcode])) {
-        $node = $context['node'];
+        $node = drupal_clone($context['node']);
 
         // Add simplenews specific header data
         $headers = array_merge($message['headers'], _simplenews_headers($node, $params['from']['address']));