From 04f070f61d7d139964c7788e77f9edd31c2f22d0 Mon Sep 17 00:00:00 2001
From: Jim <jsfb@github>
Date: Mon, 27 Jul 2015 15:46:33 -0700
Subject: [PATCH] Added an invariant to throw instead of potentially failing to
 terminate on unexpected condition.

---
 src/renderers/dom/client/ReactEventListener.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/renderers/dom/client/ReactEventListener.js b/src/renderers/dom/client/ReactEventListener.js
index d1e867db30b..c0196c3a4d7 100644
--- a/src/renderers/dom/client/ReactEventListener.js
+++ b/src/renderers/dom/client/ReactEventListener.js
@@ -22,6 +22,7 @@ var ReactUpdates = require('ReactUpdates');
 var assign = require('Object.assign');
 var getEventTarget = require('getEventTarget');
 var getUnboundedScrollPosition = require('getUnboundedScrollPosition');
+var invariant = require('invariant');
 
 var DOCUMENT_FRAGMENT_NODE_TYPE = 11;
 
@@ -128,6 +129,12 @@ function handleTopLevelWithPath(bookKeeping) {
       // Jump to the root of this React render tree
       while (currentPathElementID !== newRootID) {
         i++;
+        invariant(
+          i < path.length,
+          'Expected to find another React root ' +
+          'before reaching end of event path (%s).',
+          path
+        );
         currentPathElement = path[i];
         currentPathElementID = ReactMount.getID(currentPathElement);
       }