=== modified file 'extensions/launchpad/lib/WSLaunchpad.pm'
--- extensions/launchpad/lib/WSLaunchpad.pm	2008-07-10 17:20:55 +0000
+++ extensions/launchpad/lib/WSLaunchpad.pm	2008-09-15 10:55:25 +0000
@@ -339,6 +339,10 @@
             "SELECT launchpad_id
                FROM bugs WHERE bug_id = ?", undef, $bug_id);
 
+    if (!defined ($old_launchpad_id)) {
+        $old_launchpad_id = 0;
+    }
+
     my $privs;
     $bug->check_can_change_field('launchpad_id', 
                                  $old_launchpad_id, $launchpad_id, \$privs)
@@ -346,8 +350,7 @@
                               { field => 'launchpad_id', privs => $privs });
 
     if (defined ($launchpad_id)) {
-        if (!defined ($old_launchpad_id) ||
-             $launchpad_id != $old_launchpad_id)
+        if ($launchpad_id != $old_launchpad_id)
         {
                $dbh->do("UPDATE bugs SET launchpad_id = ?
                          WHERE bug_id = ?", undef, $launchpad_id, $bug_id);