From e7daff1a78ddeedc6a85900a826063dbc73e630c Mon Sep 17 00:00:00 2001
From: Alon Levy <alon@pobox.com>
Date: Sun, 1 Mar 2015 00:09:02 +0200
Subject: client/rz_core: handle manual zoom

---
 src/client/rz_core.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/client/rz_core.js b/src/client/rz_core.js
index 00cfe535..3d255a03 100644
--- a/src/client/rz_core.js
+++ b/src/client/rz_core.js
@@ -55,7 +55,7 @@ var initDrawingArea = function () {
 
     function zoom() {
         zoom_g.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
-        d3.event.sourceEvent.stopPropagation();
+        d3.event.sourceEvent != null && d3.event.sourceEvent.stopPropagation();
         updateZoomProgress(true);
     }
 
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