From af26fdbff1f630fbd4dd6933880ef5b14249e997 Mon Sep 17 00:00:00 2001
From: pearcetm <tmpearce@gmail.com>
Date: Wed, 18 May 2022 12:26:19 -0400
Subject: [PATCH] Bugfix for imagetilesource _freeupCanvasMemory

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

diff --git a/src/imagetilesource.js b/src/imagetilesource.js
index cbea1ef0..6d49bbd3 100644
--- a/src/imagetilesource.js
+++ b/src/imagetilesource.js
@@ -272,8 +272,10 @@
          */
         _freeupCanvasMemory: function () {
             for (var i = 0; i < this.levels.length; i++) {
-                this.levels[i].context2D.canvas.height = 0;
-                this.levels[i].context2D.canvas.width = 0;
+                if(this.levels[i].context2D){
+                    this.levels[i].context2D.canvas.height = 0;
+                    this.levels[i].context2D.canvas.width = 0;
+                }
             }
         },
     });