From 3cae6a4a864eb68d6d6eec23cd4a37416c580a73 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Tue, 22 Aug 2017 22:35:22 +0200
Subject: [PATCH] Platform: don't assume canvas is in all windowless Emscripten
 apps.

Some apps might not use GL context at all.
---
 src/Magnum/Platform/WindowlessEmscriptenApplication.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Magnum/Platform/WindowlessEmscriptenApplication.js b/src/Magnum/Platform/WindowlessEmscriptenApplication.js
index f8a53fa65..3d41835f0 100644
--- a/src/Magnum/Platform/WindowlessEmscriptenApplication.js
+++ b/src/Magnum/Platform/WindowlessEmscriptenApplication.js
@@ -57,6 +57,6 @@ for(var i = 0; i != args.length; ++i) {
 
 Module.setStatus('Downloading...');
 
-Module.canvas.addEventListener('contextmenu', function(event) {
+if(Module.canvas) Module.canvas.addEventListener('contextmenu', function(event) {
     event.preventDefault();
 }, true);