diff --git a/Mail/Queue.php b/Mail/Queue.php
index 7f39c64..5d1513f 100644
--- a/Mail/Queue.php
+++ b/Mail/Queue.php
@@ -376,7 +376,7 @@ function sendMailsInQueue($limit = MAILQUEUE_ALL, $offset = MAILQUEUE_START,
         }
 
         $this->container->setOption($limit, $offset, $try);
-        while ($mail = $this->get()) {
+        while ($mail = $this->get() && !Pear::isError($mail)) {
             $this->container->countSend($mail);
 
             $result = $this->sendMail($mail, true);