From 31a45565fd028ffd58bbd7a32212f1d76b4ca491 Mon Sep 17 00:00:00 2001
From: Daniel Brain <daniel@bluesuncorp.co.uk>
Date: Tue, 27 Nov 2018 01:40:45 -0800
Subject: [PATCH] Fix proxy window clean

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

diff --git a/src/serialize/window.js b/src/serialize/window.js
index c5810ca3..e62b5339 100644
--- a/src/serialize/window.js
+++ b/src/serialize/window.js
@@ -16,7 +16,7 @@ function cleanupProxyWindows() {
     for (let id of idToProxyWindow.keys()) {
         // $FlowFixMe
         if (idToProxyWindow.get(id).shouldClean()) {
-            delete idToProxyWindow[id];
+            idToProxyWindow.del(id);
         }
     }
 }