From 1f87dcc6b89b6ac910a92d30baab96805222d753 Mon Sep 17 00:00:00 2001
From: Murad Khafizov <mkhafizov@definiens.com>
Date: Thu, 27 Apr 2017 16:00:12 +0200
Subject: [PATCH] fix crashing on using undefined segmentWriter

---
 src/ol/interaction/snap.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/ol/interaction/snap.js b/src/ol/interaction/snap.js
index 3e10becec3..ae54a67bca 100644
--- a/src/ol/interaction/snap.js
+++ b/src/ol/interaction/snap.js
@@ -418,8 +418,10 @@ ol.interaction.Snap.prototype.updateFeature_ = function(feature) {
 ol.interaction.Snap.prototype.writeGeometryCollectionGeometry_ = function(feature, geometry) {
   var i, geometries = geometry.getGeometriesArray();
   for (i = 0; i < geometries.length; ++i) {
-    this.SEGMENT_WRITERS_[geometries[i].getType()].call(
-        this, feature, geometries[i]);
+    var segmentWriter = this.SEGMENT_WRITERS_[geometries[i].getType()];
+    if(segmentWriter) {
+      segmentWriter.call(this, feature, geometries[i]);
+    }
   }
 };