From a681949995e5680b93c71bdb1faea318c832f979 Mon Sep 17 00:00:00 2001
From: Berkeley Martinez <Berkeley@robotie.com>
Date: Sat, 9 Jan 2016 22:47:28 -0800
Subject: [PATCH] Fix mobile touches can be empty. Use changedTouches as backup

---
 common/app/routes/Hikes/flux/Actions.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/common/app/routes/Hikes/flux/Actions.js b/common/app/routes/Hikes/flux/Actions.js
index f93f5932fb4..dcde5c25957 100644
--- a/common/app/routes/Hikes/flux/Actions.js
+++ b/common/app/routes/Hikes/flux/Actions.js
@@ -38,12 +38,13 @@ function findNextHike(hikes, id) {
 
 
 function getMouse(e, [dx, dy]) {
-  let { pageX, pageY, touches } = e;
+  let { pageX, pageY, touches, changedTouches } = e;
 
-  if (touches) {
+  // touches can be empty on touchend
+  if (touches || changedTouches) {
     e.preventDefault();
     // these re-assigns the values of pageX, pageY from touches
-    ({ pageX, pageY } = touches[0]);
+    ({ pageX, pageY } = touches[0] || changedTouches[0]);
   }
 
   return [pageX - dx, pageY - dy];