From 8f77a300de67f6dc4b5c60096213cb14c813f875 Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Tue, 4 Jun 2019 13:38:58 +0200
Subject: [PATCH] Handle case of no used tiles

---
 src/ol/renderer/canvas/VectorTileLayer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ol/renderer/canvas/VectorTileLayer.js b/src/ol/renderer/canvas/VectorTileLayer.js
index df50af3a29..75f864cb7c 100644
--- a/src/ol/renderer/canvas/VectorTileLayer.js
+++ b/src/ol/renderer/canvas/VectorTileLayer.js
@@ -416,7 +416,7 @@ class CanvasVectorTileLayerRenderer extends CanvasTileLayerRenderer {
     // Unqueue tiles from the image queue when we don't need any more
     const usedTiles = frameState.usedTiles[getUid(source)];
     for (const tileUid in this.renderTileImageQueue_) {
-      if (!(tileUid in usedTiles)) {
+      if (!usedTiles || !(tileUid in usedTiles)) {
         delete this.renderTileImageQueue_[tileUid];
       }
     }