From a3dda100f4355ca3a27fe2a40eb899df99685ea3 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Fri, 1 Sep 2017 14:00:11 -0400
Subject: [PATCH] x11: don't try to make a NULL GL context current when we
 already did that.

---
 src/video/x11/SDL_x11opengl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/video/x11/SDL_x11opengl.c b/src/video/x11/SDL_x11opengl.c
index bf9a98e91..828a18d9f 100644
--- a/src/video/x11/SDL_x11opengl.c
+++ b/src/video/x11/SDL_x11opengl.c
@@ -452,7 +452,9 @@ X11_GL_InitExtensions(_THIS)
     if (context) {
         _this->gl_data->glXMakeCurrent(display, None, NULL);
         _this->gl_data->glXDestroyContext(display, context);
-        _this->gl_data->glXMakeCurrent(display, w, current_context);
+        if (current_context) {
+            _this->gl_data->glXMakeCurrent(display, w, current_context);
+        }
     }
 
     X11_XDestroyWindow(display, w);