From 843fcc973f4cf7b149d4f57732fb66f812115320 Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adamc@hcoop.net>
Date: Sun, 29 Mar 2009 11:37:29 -0400
Subject: Redo channels, making them single-client

---
 lib/js/urweb.js | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/js/urweb.js')

diff --git a/lib/js/urweb.js b/lib/js/urweb.js
index c7cecbbf..4daee66d 100644
--- a/lib/js/urweb.js
+++ b/lib/js/urweb.js
@@ -301,6 +301,9 @@ function listener() {
 }
 
 function rv(chn, parse, k) {
+  if (chn == null)
+    return;
+
   if (chn < 0)
     whine("Out-of-bounds channel receive");
 
-- 
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