diff --git a/src/networkpluginserver.cpp b/src/networkpluginserver.cpp
index a012ee87..8e80e321 100644
--- a/src/networkpluginserver.cpp
+++ b/src/networkpluginserver.cpp
@@ -708,6 +708,10 @@ void NetworkPluginServer::handleConvMessageAckPayload(const std::string &data) {
 	if (!user)
 		return;
 
+	if (payload.id().empty()) {
+		LOG4CXX_WARN(logger, "Received message ack with empty ID, not forwarding to XMPP.");
+		return;
+	}
 
 	boost::shared_ptr<Swift::Message> msg(new Swift::Message());
 	msg->addPayload(boost::make_shared<Swift::DeliveryReceipt>(payload.id()));
diff --git a/src/transport.cpp b/src/transport.cpp
index 106f0622..7bd92b4d 100644
--- a/src/transport.cpp
+++ b/src/transport.cpp
@@ -231,8 +231,12 @@ void Component::handleConnected() {
 
 void Component::handleServerStopped(boost::optional<Swift::BoostConnectionServer::Error> e) {
 	if(e != NULL ) {
-		if(*e == Swift::BoostConnectionServer::Conflict)
+		if(*e == Swift::BoostConnectionServer::Conflict) {
 			LOG4CXX_INFO(logger, "Port "<< CONFIG_INT(m_config, "service.port") << " already in use! Stopping server..");
+			if (CONFIG_INT(m_config, "service.port") == 5347) {
+				LOG4CXX_INFO(logger, "Port 5347 is usually used for components. You are using server_mode=1. Are you sure you don't want to use server_mode=0 and run spectrum as component?");
+			}
+		}
 		if(*e == Swift::BoostConnectionServer::UnknownError)
 			LOG4CXX_INFO(logger, "Unknown error occured! Stopping server..");
 		exit(1);