From cef7dfcdbba360eec7484b87ce6f549e46716f71 Mon Sep 17 00:00:00 2001
From: BrennanConroy <brecon@microsoft.com>
Date: Tue, 7 Aug 2018 14:14:32 -0700
Subject: [PATCH] Check connection state in ping Typescript client (#2753)

---
 clients/ts/signalr/src/HubConnection.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/clients/ts/signalr/src/HubConnection.ts b/clients/ts/signalr/src/HubConnection.ts
index 749bc6c4f6..ea3d71cd4d 100644
--- a/clients/ts/signalr/src/HubConnection.ts
+++ b/clients/ts/signalr/src/HubConnection.ts
@@ -406,7 +406,11 @@ export class HubConnection {
 
     private resetKeepAliveInterval() {
         this.cleanupPingTimer();
-        this.pingServerHandle = setTimeout(() => this.sendMessage(this.cachedPingMessage), this.keepAliveIntervalInMilliseconds);
+        this.pingServerHandle = setTimeout(async () => {
+            if (this.connectionState === HubConnectionState.Connected) {
+                await this.sendMessage(this.cachedPingMessage);
+            }
+        }, this.keepAliveIntervalInMilliseconds);
     }
 
     private resetTimeoutPeriod() {