From ed4d0f2577107e4282926156ef5a5453dff6fbc4 Mon Sep 17 00:00:00 2001
From: David Back <davidback@highfidelity.io>
Date: Tue, 3 Jul 2018 12:39:41 -0700
Subject: [PATCH] early-out if event undefined

---
 .../system/libraries/entitySelectionTool.js    | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/scripts/system/libraries/entitySelectionTool.js b/scripts/system/libraries/entitySelectionTool.js
index cd3c9fe418..9dee29ba78 100644
--- a/scripts/system/libraries/entitySelectionTool.js
+++ b/scripts/system/libraries/entitySelectionTool.js
@@ -1654,6 +1654,10 @@ SelectionDisplay = (function() {
             return (origin.y - intersection.y) / Vec3.distance(origin, intersection);
         },
         onMove: function(event) {
+			if (event.x === undefined || event.y === undefined) {
+				return;
+			}
+			
             var wantDebug = false;
             var pickRay = generalComputePickRay(event.x, event.y);
 
@@ -1811,6 +1815,10 @@ SelectionDisplay = (function() {
                 pushCommandForSelections(duplicatedEntityIDs);
             },
             onMove: function(event) {
+				if (event.x === undefined || event.y === undefined) {
+					return;
+				}
+
                 var pickRay = generalComputePickRay(event.x, event.y);
                 
                 // Use previousPickRay if new pickRay will cause resulting rayPlaneIntersection values to wrap around
@@ -2060,7 +2068,11 @@ SelectionDisplay = (function() {
             pushCommandForSelections();
         };
 
-        var onMove = function(event) {
+        var onMove = function(event) 
+			if (event.x === undefined || event.y === undefined) {
+				return;
+			}
+			
             var proportional = (spaceMode === SPACE_WORLD) || directionEnum === STRETCH_DIRECTION.ALL;
             
             var position, rotation;
@@ -2393,6 +2405,10 @@ SelectionDisplay = (function() {
                     // EARLY EXIT
                     return;
                 }
+				
+				if (event.x === undefined || event.y === undefined) {
+					return;
+				}
                 
                 var wantDebug = false;
                 if (wantDebug) {