Index: includes/batch.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/batch.inc,v
retrieving revision 1.50
diff -u -r1.50 batch.inc
--- includes/batch.inc	17 Feb 2010 22:44:51 -0000	1.50
+++ includes/batch.inc	5 Sep 2010 13:06:09 -0000
@@ -343,7 +343,7 @@
 
     $current    = $total - $remaining + $finished;
     $percentage = _batch_api_percentage($total, $current);
-    $elapsed    = $current_set['elapsed'];
+    $elapsed    = isset($current_set['elapsed']) ? $current_set['elapsed'] : 0;
     $values     = array(
       '@remaining'  => $remaining,
       '@total'      => $total,