From 9cd378caa735214d715e1e4a456750d8e1bb72b5 Mon Sep 17 00:00:00 2001
From: paul4334 <paul.sultana@pc-doctor.com>
Date: Tue, 6 Dec 2016 15:19:05 -0800
Subject: [PATCH] GLX: Check whether client string is NULL

In very rare cases the X server reports the GLX extension as present but
functions return invalid fallback values.

Closes #912.
---
 src/glx_context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/glx_context.c b/src/glx_context.c
index 23030161..2faf599c 100644
--- a/src/glx_context.c
+++ b/src/glx_context.c
@@ -59,7 +59,7 @@ static GLFWbool chooseGLXFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* res
     // HACK: This is a (hopefully temporary) workaround for Chromium
     //       (VirtualBox GL) not setting the window bit on any GLXFBConfigs
     vendor = glXGetClientString(_glfw.x11.display, GLX_VENDOR);
-    if (strcmp(vendor, "Chromium") == 0)
+    if (vendor && strcmp(vendor, "Chromium") == 0)
         trustWindowBit = GLFW_FALSE;
 
     nativeConfigs =