From b5dd3304ee3339717fbf107df96f3b13b1dfc85d Mon Sep 17 00:00:00 2001
From: Tim Edwards <tim@opencircuitdesign.com>
Date: Wed, 4 Oct 2017 21:57:54 -0400
Subject: [PATCH] Additional small correction.

---
 graphics/grTOGL3.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/graphics/grTOGL3.c b/graphics/grTOGL3.c
index 458af7f3..6e236203 100644
--- a/graphics/grTOGL3.c
+++ b/graphics/grTOGL3.c
@@ -251,6 +251,7 @@ grtoglFreeBackingStore(MagWindow *w)
    RenderFrame *rf;
 
    rf = (RenderFrame *)w->w_backingStore;
+   if (rf == NULL) return;
    glDeleteFramebuffers(1, &rf->framebuffer);
    glDeleteRenderbuffers(1, &rf->renderbuffer);
    freeMagic(w->w_backingStore);