Index: includes/actions.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/actions.inc,v
retrieving revision 1.34
diff -u -p -r1.34 actions.inc
--- includes/actions.inc	18 Oct 2009 06:56:23 -0000	1.34
+++ includes/actions.inc	19 Feb 2010 02:03:53 -0000
@@ -126,7 +126,12 @@ function actions_do($action_ids, $object
     }
     // Singleton action; $action_ids is the function name.
     else {
-      $actions_result[$action_ids] = $action_ids($object, $context, $a1, $a2);
+      if (function_exists($action_ids)) {
+        $actions_result[$action_ids] = $action_ids($object, $context, $a1, $a2);
+      }
+      else {
+        $actions_result[$action_ids] = FALSE;
+      }
     }
   }
   $stack--;