From 99f6ea8934fa9fa087c7351010c85a0b712a9047 Mon Sep 17 00:00:00 2001
From: Matt Sprague <uforic@users.noreply.github.com>
Date: Fri, 25 May 2018 15:48:32 -0700
Subject: [PATCH] Map constructor should fail if WebGL init fails.

---
 src/ui/map.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ui/map.js b/src/ui/map.js
index 9571fb28b99..af90c38d415 100755
--- a/src/ui/map.js
+++ b/src/ui/map.js
@@ -339,6 +339,9 @@ class Map extends Camera {
 
         this._setupContainer();
         this._setupPainter();
+        if (this.painter === undefined) {
+            throw new Error(`Failed to initialize WebGL.`);
+        }
 
         this.on('move', this._update.bind(this, false));
         this.on('zoom', this._update.bind(this, true));