From c628f46591b4063f11771c80cea5acf768496f1d Mon Sep 17 00:00:00 2001
From: Edward Silverton <e.silverton@gmail.com>
Date: Tue, 14 Jul 2020 14:46:58 +0100
Subject: [PATCH] fix for OSD 'unload' before is has time to bootstrap

---
 src/viewer.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/viewer.js b/src/viewer.js
index b5b24318..f98b6182 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -240,6 +240,11 @@ $.Viewer = function( options ) {
     }
 
     this.element              = this.element || document.getElementById( this.id );
+
+    if (!this.element) {
+        return;
+    }
+
     this.canvas               = $.makeNeutralElement( "div" );
 
     this.canvas.className = "openseadragon-canvas";