Index: modules/node/node.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.module,v
retrieving revision 1.966
diff -u -p -r1.966 node.module
--- modules/node/node.module	15 May 2008 21:40:31 -0000	1.966
+++ modules/node/node.module	21 May 2008 21:22:35 -0000
@@ -861,10 +861,13 @@ function node_save(&$node) {
 
   $node->is_new = FALSE;
 
-  // Apply filters to some default node fields:
   if (empty($node->nid)) {
     // Insert a new node.
     $node->is_new = TRUE;
+  }
+  
+  // Apply filters to some default node fields on insertion:
+  if ($node->is_new || !empty($node->revision)) {
 
     // When inserting a node, $node->log must be set because
     // {node_revisions}.log does not (and cannot) have a default
@@ -884,9 +887,11 @@ function node_save(&$node) {
     if (!isset($node->body)) {
       $node->body = '';
     }
-  }
-  elseif (!empty($node->revision)) {
-    $node->old_vid = $node->vid;
+
+    // Save the old revision if needed.
+    if (!empty($node->revision)) {
+      $node->old_vid = $node->vid;
+    }
   }
   else {
     // When updating a node, avoid clobberring an existing log entry with an empty one.