From c3ff3f5d1ac57dc88f07aba1c46f71c3539eefc6 Mon Sep 17 00:00:00 2001
From: Andy Wang <cbeuw.andy@gmail.com>
Date: Wed, 21 Aug 2019 13:14:23 +0100
Subject: [PATCH] Fix the weird nil pointer again

---
 internal/multiplex/switchboard.go | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/internal/multiplex/switchboard.go b/internal/multiplex/switchboard.go
index b7e8419..d315ac8 100644
--- a/internal/multiplex/switchboard.go
+++ b/internal/multiplex/switchboard.go
@@ -100,10 +100,14 @@ func (sb *switchboard) send(data []byte, connId *uint32) (n int, err error) {
 				return 0, errBrokenSwitchboard
 			}
 			newConnId := rand.Intn(len(sb.conns))
-			conn, _ = sb.conns[uint32(newConnId)]
-			n, err = conn.Write(data)
-			sb.AddTx(int64(n))
-			return
+			conn, ok = sb.conns[uint32(newConnId)]
+			if !ok {
+				return 0, errBrokenSwitchboard
+			} else {
+				n, err = conn.Write(data)
+				sb.AddTx(int64(n))
+				return
+			}
 		}
 	}