From 106c7f04276facfc3a6a61cf1f4229e7836c652d Mon Sep 17 00:00:00 2001
From: pb376 <pb376@cornell.edu>
Date: Wed, 28 Sep 2022 14:19:34 -0500
Subject: [PATCH] Avoid closing nil tls connection #919

---
 implant/sliver/transports/beacon.go | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/implant/sliver/transports/beacon.go b/implant/sliver/transports/beacon.go
index b05cc286e4..869104bc32 100644
--- a/implant/sliver/transports/beacon.go
+++ b/implant/sliver/transports/beacon.go
@@ -211,11 +211,13 @@ func mtlsBeacon(uri *url.URL) *Beacon {
 			return mtls.WriteEnvelope(conn, envelope)
 		},
 		Close: func() error {
-			err = conn.Close()
-			if err != nil {
-				return err
+			if conn != nil {
+				err = conn.Close()
+				if err != nil {
+					return err
+				}
+				conn = nil
 			}
-			conn = nil
 			return nil
 		},
 		Cleanup: func() error {