From 7454df0c2f626ded438d8a1aa677a1c91e69cf13 Mon Sep 17 00:00:00 2001
From: Andreas Hocevar <andreas.hocevar@gmail.com>
Date: Mon, 14 Oct 2019 14:13:57 +0200
Subject: [PATCH] Resolve empty when tile not loaded yet

---
 src/ol/renderer/canvas/VectorTileLayer.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ol/renderer/canvas/VectorTileLayer.js b/src/ol/renderer/canvas/VectorTileLayer.js
index 3c007896f7..27842f8fda 100644
--- a/src/ol/renderer/canvas/VectorTileLayer.js
+++ b/src/ol/renderer/canvas/VectorTileLayer.js
@@ -432,6 +432,10 @@ class CanvasVectorTileLayerRenderer extends CanvasTileLayerRenderer {
           break;
         }
       }
+      if (!sourceTile) {
+        resolve([]);
+        return;
+      }
       const corner = getTopLeft(tileGrid.getTileCoordExtent(sourceTile.tileCoord));
       const tilePixel = [
         (coordinate[0] - corner[0]) / resolution,