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On page move over redirect, I'm seeing errors where the move may fail with "PHP Fatal error: Call to a member function timestamp() on a non-object in ...includes/Title.php on line 2860"

Title.php: function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) invokes
  $rcts = $dbw->timestamp( $nt->getEarliestRevTime() );
without first checking that $dbw is a valid object.

I've tried substituting:

 $rcts = '';
 if ($dbw != null)
      $rcts = $dbw->timestamp( $nt->getEarliestRevTime() );

for this code, which allows the move operation to proceed. I'm running the MW 1.16alpha obtained from SVN on August 15th, 2009.