From 05ece4d167cf26c95ef58cc80e912dbd43d44c86 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Fri, 2 Aug 2019 14:37:09 +0200
Subject: [PATCH] wintun: handle error for deadgwdetect

---
 tun/wintun/wintun_windows.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tun/wintun/wintun_windows.go b/tun/wintun/wintun_windows.go
index 26ebf60..09bf14f 100644
--- a/tun/wintun/wintun_windows.go
+++ b/tun/wintun/wintun_windows.go
@@ -362,9 +362,10 @@ func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *W
 		key, err = registry.OpenKey(registry.LOCAL_MACHINE, tcpipInterfaceRegKeyName, registry.SET_VALUE)
 		if err != nil {
 			err = fmt.Errorf("Error opening interface-specific TCP/IP network registry key: %v", err)
+		} else {
+			key.SetDWordValue("EnableDeadGWDetect", 0)
+			key.Close()
 		}
-		key.SetDWordValue("EnableDeadGWDetect", 0)
-		key.Close()
 	}
 
 	if err == nil {