From d62bf415f0ff3acb6bef1cfca36605cc12a6c6ca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20Ka=CC=88fer?= <mail@kkaefer.com>
Date: Thu, 12 Feb 2015 11:35:18 -0800
Subject: [PATCH] Fail early in case there is no display

---
 platform/default/headless_view.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/platform/default/headless_view.cpp b/platform/default/headless_view.cpp
index 5f41994c2..975e7f58f 100644
--- a/platform/default/headless_view.cpp
+++ b/platform/default/headless_view.cpp
@@ -100,6 +100,10 @@ void HeadlessView::loadExtensions() {
 }
 
 void HeadlessView::createContext() {
+    if (!display_) {
+        throw std::runtime_error("Display is not set");
+    }
+
 #if MBGL_USE_CGL
     CGLError error = CGLCreateContext(display_->pixelFormat, NULL, &glContext);
     if (error != kCGLNoError) {