From 708d6d9a225d93b748cc2baef0cc5e657ade914c Mon Sep 17 00:00:00 2001
From: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Date: Wed, 20 Dec 2023 08:18:45 +0100
Subject: [PATCH] fix: handle missing resolver (#52604)

---
 client/static/python-input-sw.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/client/static/python-input-sw.js b/client/static/python-input-sw.js
index cdd4fcdf196..aabddd7180f 100644
--- a/client/static/python-input-sw.js
+++ b/client/static/python-input-sw.js
@@ -9,7 +9,7 @@ self.addEventListener('activate', function() {
 let resolver;
 
 self.onmessage = function(event) {
-  resolver(event.data);
+  if (resolver) resolver(event.data);
 }
 
 self.addEventListener('fetch', (event) => {