diff --git a/inc/IXR_Library.php b/inc/IXR_Library.php
index afa496aed75a3e26b0fa65e4fae4d15deb999e8e..4f8eb31c1d73db66ffc096aec3f4bd18f9512859 100644
--- a/inc/IXR_Library.php
+++ b/inc/IXR_Library.php
@@ -150,6 +150,7 @@ class IXR_Message {
         $this->message = str_replace('&', '&', $this->message);
         $this->message = str_replace(''', ''', $this->message);
         $this->message = str_replace('"', '"', $this->message);
+        $this->message = str_replace("\x0b", ' ', $this->message); //vertical tab
         if (trim($this->message) == '') {
             return false;
         }