diff --git a/src/kits/app/RosterPrivate.cpp b/src/kits/app/RosterPrivate.cpp
index 06f730c540..261b84c8ca 100644
--- a/src/kits/app/RosterPrivate.cpp
+++ b/src/kits/app/RosterPrivate.cpp
@@ -48,7 +48,7 @@ BRoster::Private::SetTo(BMessenger mainMessenger, BMessenger mimeMessenger)
 
 	\param message The message to be sent.
 	\param reply A pointer to a pre-allocated BMessage into which the reply
-		   message will be copied.
+		   message will be copied. May be \c NULL.
 	\param mime \c true, if the message should be sent to the MIME data base
 		   service, \c false for the roster.
 	\return
@@ -65,10 +65,12 @@ BRoster::Private::SendTo(BMessage *message, BMessage *reply, bool mime)
 	if (fRoster == NULL)
 		return B_NO_INIT;
 
-	if (mime)
-		return fRoster->_MimeMessenger().SendMessage(message, reply);
+	const BMessenger& messenger = mime
+		? fRoster->_MimeMessenger() : fRoster->fMessenger;
 
-	return fRoster->fMessenger.SendMessage(message, reply);
+	return reply != NULL
+		? messenger.SendMessage(message, reply)
+		: messenger.SendMessage(message);
 }