diff --git a/webform.module b/webform.module
index 612adb0..ac6b654 100644
--- a/webform.module
+++ b/webform.module
@@ -2587,6 +2587,14 @@ function _webform_fetch_draft_sid($nid, $uid) {
 function _webform_filter_values($string, $node = NULL, $submission = NULL, $email = NULL, $strict = TRUE, $allow_anonymous = FALSE) {
   global $user;
   static $replacements;
+  
+  // Use the current node as a fallback if it wasn't passed in.
+  if ($node == NULL) {
+    $q = $_GET['q'];
+    $q = explode('/',$q);
+    $qid = (int)$q[1];
+    $node = node_load($qid);
+  }
 
   // Don't do any filtering if the string is empty.
   if (strlen(trim($string)) == 0) {