From b5c6fc7ebb3ad83e174211b7858983a8652a774a Mon Sep 17 00:00:00 2001
From: Richard Gibson <richard.gibson@gmail.com>
Date: Fri, 23 Oct 2015 12:42:40 -0400
Subject: [PATCH] Ajax: Don't let onreadystatechange preempt exceptions from
 xhr.send

Ref 0a6e1c4b191f177fce2dac5fd3a17b76f853fd26
---
 src/ajax/xhr.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ajax/xhr.js b/src/ajax/xhr.js
index b624171389..5e34d38127 100644
--- a/src/ajax/xhr.js
+++ b/src/ajax/xhr.js
@@ -174,8 +174,12 @@ if ( xhrSupported ) {
 						callback();
 					} else {
 
-						// Add to the list of active xhr callbacks
-						xhr.onreadystatechange = callback;
+						// Register the callback, but delay it in case `xhr.send` throws
+						xhr.onreadystatechange = function() {
+							if ( callback ) {
+								window.setTimeout( callback );
+							}
+						};
 
 						xhr.send( ( options.hasContent && options.data ) || null );
 					}