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-rw-r--r--src/client/rz_core.js2
1 files changed, 1 insertions, 1 deletions
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);
}