From 6a41d5e7adb07373659716b26f0bd1fb09733b4d Mon Sep 17 00:00:00 2001
From: Camilla Berglund <elmindreda@elmindreda.org>
Date: Sat, 31 Oct 2015 18:21:21 +0100
Subject: [PATCH] Fix NULL pointer dereference

Calling glfwMakeContextCurrent with NULL would segfault since
496f559c9af3c1c600d134f0ad06929628a7f50c.

Fixes #631.
Closes #632.
---
 src/context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/context.c b/src/context.c
index 36840e55..cda16d2d 100644
--- a/src/context.c
+++ b/src/context.c
@@ -543,7 +543,7 @@ GLFWAPI void glfwMakeContextCurrent(GLFWwindow* handle)
 
     _GLFW_REQUIRE_INIT();
 
-    if (window->context.api == GLFW_NO_API)
+    if (window && window->context.api == GLFW_NO_API)
     {
         _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
         return;