diff --git a/src/WebSocketsClient.cpp b/src/WebSocketsClient.cpp
index 3e2e49d..8866327 100644
--- a/src/WebSocketsClient.cpp
+++ b/src/WebSocketsClient.cpp
@@ -331,6 +331,7 @@ void WebSocketsClient::clientDisconnect(WSclient_t * client) {
     client->cVersion = 0;
     client->cIsUpgrade = false;
     client->cIsWebsocket = false;
+    client->SessionId = "";
 
     client->status = WSC_NOT_CONNECTED;