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-rw-r--r--program/steps/mail/func.inc2
1 files changed, 1 insertions, 1 deletions
diff --git a/program/steps/mail/func.inc b/program/steps/mail/func.inc
index 50de7108d..ae0d3a55c 100644
--- a/program/steps/mail/func.inc
+++ b/program/steps/mail/func.inc
@@ -1451,7 +1451,7 @@ function rcmail_send_mdn($message, &$smtp_error)
{
global $RCMAIL, $IMAP;
- if (!is_a($message, rcube_message))
+ if (!is_object($message) || !is_a($message, rcube_message))
$message = new rcube_message($message);
if ($message->headers->mdn_to && !$message->headers->mdn_sent &&