Index: simpletest.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/simpletest/Attic/simpletest.module,v
retrieving revision 1.33.2.4.2.21
diff -u -p -r1.33.2.4.2.21 simpletest.module
--- simpletest.module	14 Dec 2009 23:27:11 -0000	1.33.2.4.2.21
+++ simpletest.module	15 Mar 2010 21:34:28 -0000
@@ -208,7 +208,9 @@ function _simpletest_batch_operation($te
   // Drupal 6.
   require_once drupal_get_path('module', 'simpletest') . '/drupal_web_test_case.php';
   $classes = simpletest_test_get_all_classes();
-  require_once $classes[$test_class]['file'];
+  if (!empty($classes)) {
+    require_once $classes[$test_class]['file'];
+  }
 
   $test = new $test_class($test_id);
   $test->run();