Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.265.2.19
diff -u -p -r1.265.2.19 form.inc
--- includes/form.inc	22 Feb 2009 18:12:46 -0000	1.265.2.19
+++ includes/form.inc	28 Mar 2009 17:19:31 -0000
@@ -756,7 +756,10 @@ function form_execute_handlers($type, &$
 
   foreach ($handlers as $function) {
     if (function_exists($function))  {
-      if ($type == 'submit' && ($batch =& batch_get())) {
+      // Check to see if a previous _submit handler has set a batch, but 
+      // make sure we do not react to a batch that is already being processed 
+      // (for instance if a batch operation performs a drupal_execute()).
+      if ($type == 'submit' && ($batch =& batch_get()) && !isset($batch['current_set'])) {
         // Some previous _submit handler has set a batch. We store the call
         // in a special 'control' batch set, for execution at the correct
         // time during the batch processing workflow.