Index: includes/update.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/update.inc,v
retrieving revision 1.69
diff -u -p -r1.69 update.inc
--- includes/update.inc	25 Sep 2010 18:10:53 -0000	1.69
+++ includes/update.inc	1 Oct 2010 05:23:34 -0000
@@ -987,7 +987,7 @@ function update_get_update_list() {
       // module_invoke returns NULL for nonexisting hooks, so if no updates
       // are removed, it will == 0.
       $last_removed = module_invoke($module, 'update_last_removed');
-      if ($schema_version < $last_removed) {
+      if (!empty($schema_version) && $schema_version < $last_removed) {
         $ret[$module]['warning'] = '<em>' . $module . '</em> module can not be updated. Its schema version is ' . $schema_version . '. Updates up to and including ' . $last_removed . ' have been removed in this release. In order to update <em>' . $module . '</em> module, you will first <a href="http://drupal.org/upgrade">need to upgrade</a> to the last version in which these updates were available.';
         continue;
       }