=== modified file 'includes/path.inc'
--- includes/path.inc	2006-11-26 01:55:37 +0000
+++ includes/path.inc	2006-12-02 16:37:32 +0000
@@ -55,10 +55,12 @@ function drupal_lookup_path($action, $pa
   }
   elseif ($count > 0 && $path != '') {
     if ($action == 'alias') {
-      if (isset($map[$path]) || array_key_exists($path, $map)) {
+      if (isset($map[$path])) {
         return $map[$path];
       }
-      $alias = db_result(db_query("SELECT dst FROM {url_alias} WHERE src = '%s'", $path));
+      if (!$alias = db_result(db_query("SELECT dst FROM {url_alias} WHERE src = '%s'", $path))) {
+        $alias = FALSE;
+      }
       $map[$path] = $alias;
       return $alias;
     }

=== modified file 'modules/node/node.module'
--- modules/node/node.module	2006-11-28 03:20:08 +0000
+++ modules/node/node.module	2006-12-03 19:23:55 +0000
@@ -2286,7 +2286,7 @@ function node_revisions() {
           if ($node->nid) {
             if ((user_access('view revisions') || user_access('administer nodes')) && node_access('view', $node)) {
               drupal_set_title(t('Revision of %title from %date', array('%title' => $node->title, '%date' => format_date($node->revision_timestamp))));
-              return node_show($node, arg(2));
+              return node_show($node);
             }
             drupal_access_denied();
             return;