From e04288f812bc825433f19de3b64959a2354378f0 Mon Sep 17 00:00:00 2001
From: tomaka <pierre.krieger1708@gmail.com>
Date: Mon, 23 Feb 2015 15:37:23 +0100
Subject: [PATCH] Do not call wglShareLists is ctxt is null

---
 src/win32/init.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/win32/init.rs b/src/win32/init.rs
index 11a5e9f1..d4688206 100644
--- a/src/win32/init.rs
+++ b/src/win32/init.rs
@@ -397,7 +397,7 @@ fn create_context(extra: Option<(&gl::wgl_extra::Wgl, &BuilderAttribs<'static>)>
         None => {
             unsafe {
                 let ctxt = gl::wgl::CreateContext(hdc as *const libc::c_void);
-                if !share.is_null() {
+                if !ctxt.is_null() && !share.is_null() {
                     gl::wgl::ShareLists(share as *const libc::c_void, ctxt);
                 };
                 ctxt