diff --git a/Src/EngineIoClientDotNet.mono/Client/Socket.cs b/Src/EngineIoClientDotNet.mono/Client/Socket.cs
index bdbb52f..caca137 100644
--- a/Src/EngineIoClientDotNet.mono/Client/Socket.cs
+++ b/Src/EngineIoClientDotNet.mono/Client/Socket.cs
@@ -574,7 +574,7 @@ private void SetPing()
                     SetPing();
                     log2.Info("skipping Ping during upgrade");
                 }
-                else
+                else if(ReadyState == ReadyStateEnum.CLOSED)
                 {
                     Ping();
                     OnHeartbeat(PingTimeout);