Index: modules/node/node.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.module,v
retrieving revision 1.884
diff -u -r1.884 node.module
--- modules/node/node.module	25 Sep 2007 11:49:36 -0000	1.884
+++ modules/node/node.module	25 Sep 2007 14:32:15 -0000
@@ -810,7 +810,7 @@
     // Only store the log message if there's something to store; this prevents
     // existing log messages from being unintentionally overwritten by a blank
     // message. A new revision will have an empty log message (or $node->log).
-    $revisions_table_values['log'] = $node->log;
+    $revisions_table_values['log'] = !empty($node->log) ? $node->log : '';
     $revisions_table_types['log'] = "'%s'";
   }
   $node_table_values = array(
Index: modules/node/node.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.pages.inc,v
retrieving revision 1.3
diff -u -r1.3 node.pages.inc
--- modules/node/node.pages.inc	19 Sep 2007 18:11:08 -0000	1.3
+++ modules/node/node.pages.inc	25 Sep 2007 14:32:15 -0000
@@ -130,7 +130,7 @@
 
   // Add a log field if the "Create new revision" option is checked, or if the
   // current user has the ability to check that option.
-  if ($node->revision || user_access('administer nodes')) {
+  if ((isset($node->revision) && $node->revision) || user_access('administer nodes')) {
     $form['revision_information'] = array(
       '#type' => 'fieldset',
       '#title' => t('Revision information'),