From 49b75cec60fec9c8a42119b124a9c54d29d30308 Mon Sep 17 00:00:00 2001
From: Denis Badurina <denis@domonda.com>
Date: Wed, 26 Aug 2020 18:16:43 +0200
Subject: [PATCH] fix(client): send complete message and close only if socket
 is still open

---
 src/client.ts | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/src/client.ts b/src/client.ts
index 2c5c3dfa..ba2dfad4 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -232,19 +232,23 @@ export function createClient(options: ClientOptions): Client {
 
       return () => {
         if (socket) {
-          socket.send(
-            stringifyMessage<MessageType.Complete>({
-              id: uuid,
-              type: MessageType.Complete,
-            }),
-          );
+          if (socket.readyState === WebSocket.OPEN) {
+            socket.send(
+              stringifyMessage<MessageType.Complete>({
+                id: uuid,
+                type: MessageType.Complete,
+              }),
+            );
+          }
 
           socket.removeEventListener('message', handleMessage);
 
           // equal to 1 because this sink is the last one.
           // the deletion from the map happens afterwards
           if (Object.entries(subscribedSinks).length === 1) {
-            socket.close(1000, 'Normal Closure');
+            if (socket.readyState === WebSocket.OPEN) {
+              socket.close(1000, 'Normal Closure');
+            }
             socket = null;
           }
         }