From 2a3e774c60b10e9593b5a3f9596fa68f1f389d86 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Thu, 9 May 2013 09:36:06 +0200
Subject: Fix possible error on ajax request

---
 plugins/managesieve/managesieve.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/plugins/managesieve/managesieve.php b/plugins/managesieve/managesieve.php
index fc2a79ddb..f451a810e 100644
--- a/plugins/managesieve/managesieve.php
+++ b/plugins/managesieve/managesieve.php
@@ -109,6 +109,11 @@ class managesieve extends rcube_plugin
      */
     function mail_task_handler()
     {
+        // make sure we're not in ajax request
+        if ($this->rc->output->type != 'html') {
+            return;
+        }
+
         // use jQuery for popup window
         $this->require_plugin('jqueryui');
 
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