From http://www.jwz.org/xscreensaver/xscreensaver-5.33.tar.gz

[xscreensaver] / utils / visual.c

diff --git a/utils/visual.c b/utils/visual.c
index b3f06061a01b41b58261b2564b52a3735fe3eca6..f0cd20db5390831ccf0df26d4bbd1abd1ca0c1f1 100644 (file)
--- a/utils/visual.c
+++ b/utils/visual.c
@@ -295,7 +295,7 @@ pick_best_gl_visual (Screen *screen)
 
   int ndepths = 0;
   int *depths = XListDepths (dpy, screen_number (screen), &ndepths);
-  int screen_depth = depths[ndepths];
+  int screen_depth = (depths && ndepths) ? depths[ndepths - 1] : 0;
   XFree (depths);
 
   vi_in.class = TrueColor;