From 6da92d5f718644e77d8cbf6e0d8af30dfb988dc6 Mon Sep 17 00:00:00 2001
From: Andreas Hocevar <andreas.hocevar@gmail.com>
Date: Sat, 21 Oct 2017 21:41:56 +0200
Subject: [PATCH] Handle null tile coordinates correctly

---
 src/ol/source/vectortile.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ol/source/vectortile.js b/src/ol/source/vectortile.js
index 11e6aba910..9a1c6976ef 100644
--- a/src/ol/source/vectortile.js
+++ b/src/ol/source/vectortile.js
@@ -120,7 +120,7 @@ ol.source.VectorTile.prototype.getTile = function(z, x, y, pixelRatio, projectio
         tileCoord, projection);
     var tile = new ol.VectorImageTile(
         tileCoord,
-        urlTileCoord !== undefined ? ol.TileState.IDLE : ol.TileState.EMPTY,
+        urlTileCoord !== null ? ol.TileState.IDLE : ol.TileState.EMPTY,
         this.getRevision(),
         this.format_, this.tileLoadFunction, urlTileCoord, this.tileUrlFunction,
         this.tileGrid, this.getTileGridForProjection(projection),