fixed #1387

daemon/UPnP.cpp

@@ -110,6 +110,7 @@ namespace transport
 		}
 
 		err = UPNP_GetValidIGD (m_Devlist, &m_upnpUrls, &m_upnpData, m_NetworkAddr, sizeof (m_NetworkAddr));
+        m_upnpUrlsInitialized=err!=0;
 		if (err == UPNP_IGD_VALID_CONNECTED)
 		{
             err = UPNP_GetExternalIPAddress (m_upnpUrls.controlURL, m_upnpData.first.servicetype, m_externalIPAddress);
@@ -218,6 +219,9 @@ namespace transport
 
 	void UPnP::CloseMapping (std::shared_ptr<i2p::data::RouterInfo::Address> address)
 	{
+        if(!m_upnpUrlsInitialized) {
+            return;
+        }
 		std::string strType (GetProto (address)), strPort (std::to_string (address->port));
 		int err = UPNPCOMMAND_SUCCESS;
 		
@@ -233,7 +237,10 @@ namespace transport
 	{
 		freeUPNPDevlist (m_Devlist);
 		m_Devlist = 0;
+        if(m_upnpUrlsInitialized){
             FreeUPNPUrls (&m_upnpUrls);
+            m_upnpUrlsInitialized=false;
+        }
     }
 
 	std::string UPnP::GetProto (std::shared_ptr<i2p::data::RouterInfo::Address> address)

daemon/UPnP.h

@@ -60,6 +60,7 @@ namespace transport
 		std::mutex m_StartedMutex;
 		boost::asio::io_service m_Service;
 		boost::asio::deadline_timer m_Timer;
+        bool m_upnpUrlsInitialized=false;
 		struct UPNPUrls m_upnpUrls;
 		struct IGDdatas m_upnpData;
 

qt/i2pd_qt/i2pd_qt.pro

@@ -6,9 +6,7 @@ TARGET = i2pd_qt
 TEMPLATE = app
 QMAKE_CXXFLAGS *= -std=c++11 -Wno-unused-parameter -Wno-maybe-uninitialized
 
-# For now, disable UPnP which currently crashes in UPnP::Stop() -- https://github.com/PurpleI2P/i2pd/issues/1387
-#DEFINES += USE_UPNP
-DEFINES -= USE_UPNP
+DEFINES += USE_UPNP
 
 CONFIG(debug, debug|release) {
     message(Debug build)