From a9ec9d2b269e78ea0c3274fb88a7a30fa1321213 Mon Sep 17 00:00:00 2001
From: Daniel Nalborczyk <dnalborczyk@gmail.com>
Date: Mon, 8 Jul 2019 11:45:10 -0400
Subject: [PATCH] Bugfix for no queryStringParameters, fixes #738

---
 src/ApiGatewayWebSocket.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ApiGatewayWebSocket.js b/src/ApiGatewayWebSocket.js
index 58490abaf..d8788c67f 100644
--- a/src/ApiGatewayWebSocket.js
+++ b/src/ApiGatewayWebSocket.js
@@ -196,7 +196,7 @@ module.exports = class ApiGatewayWebSocket {
                 this.options,
               );
 
-              if (Object.keys(queryStringParameters).length > 0) {
+              if (Object.keys(queryStringParameters || {}).length > 0) {
                 event = { queryStringParameters, ...event };
               }