From 68589db576ad593ec7905c92ebad70b1003d28e1 Mon Sep 17 00:00:00 2001
From: xtaci <daniel820313@gmail.com>
Date: Tue, 5 Nov 2019 19:23:10 +0800
Subject: [PATCH] prevent putting back nil value

---
 kcp.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/kcp.go b/kcp.go
index b833e3b..c42f7f3 100644
--- a/kcp.go
+++ b/kcp.go
@@ -1055,10 +1055,14 @@ func (kcp *KCP) remove_front(q []segment, n int) []segment {
 // Release all cached outgoing segments
 func (kcp *KCP) ReleaseTX() {
 	for k := range kcp.snd_queue {
-		xmitBuf.Put(kcp.snd_queue[k].data)
+		if kcp.snd_queue[k].data != nil {
+			xmitBuf.Put(kcp.snd_queue[k].data)
+		}
 	}
 	for k := range kcp.snd_buf {
-		xmitBuf.Put(kcp.snd_buf[k].data)
+		if kcp.snd_buf[k].data != nil {
+			xmitBuf.Put(kcp.snd_buf[k].data)
+		}
 	}
 	kcp.snd_queue = nil
 	kcp.snd_buf = nil