From 882b65ccf1ea00c32e1074294bb5d3e1fd9aae6c Mon Sep 17 00:00:00 2001
From: nathan <nathan@dorkbox.com>
Date: Thu, 29 Mar 2018 23:07:23 +0200
Subject: [PATCH] Only try to close active datagram sessions

---
 src/io/netty/bootstrap/SessionManager.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/io/netty/bootstrap/SessionManager.java b/src/io/netty/bootstrap/SessionManager.java
index 2d8249dd..4aa115ee 100644
--- a/src/io/netty/bootstrap/SessionManager.java
+++ b/src/io/netty/bootstrap/SessionManager.java
@@ -129,7 +129,9 @@ class SessionManager extends ChannelInboundHandlerAdapter {
         // We make a copy of this b/c of concurrent modification, in the event this is closed BEFORE the child-channels are closed
         ArrayList<DatagramSessionChannel> channels = new ArrayList<DatagramSessionChannel>(datagramChannels.values());
         for (DatagramSessionChannel datagramSessionChannel : channels) {
-            datagramSessionChannel.close();
+            if (datagramSessionChannel.isActive()) {
+                datagramSessionChannel.close();
+            }
         }
     }