From 6ae3445c2eb0255034976edbb4d16b6962936cfb Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Wed, 31 Oct 2018 16:34:00 +0100
Subject: [PATCH] miniupnpcmodule.c: check return of WSAStartup()

---
 miniupnpc/miniupnpcmodule.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/miniupnpc/miniupnpcmodule.c b/miniupnpc/miniupnpcmodule.c
index 8657a0e..14dde5a 100644
--- a/miniupnpc/miniupnpcmodule.c
+++ b/miniupnpc/miniupnpcmodule.c
@@ -676,6 +676,16 @@ initminiupnpc(void)
     /* initialize Winsock. */
     WSADATA wsaData;
     int nResult = WSAStartup(MAKEWORD(2,2), &wsaData);
+	if (nResult != 0)
+	{
+		/* error code could be WSASYSNOTREADY WSASYSNOTREADY
+		 * WSASYSNOTREADY WSASYSNOTREADY WSASYSNOTREADY */
+#if PY_MAJOR_VERSION >= 3
+        return 0;
+#else
+        return;
+#endif
+	}
 
     UPnPType.tp_new = PyType_GenericNew;
 #endif