--- a/test/testgles.c	Sat Oct 05 17:08:19 2013 +0200
+++ b/test/testgles.c	Sat Oct 05 19:09:03 2013 -0700
@@ -312,6 +312,8 @@
             SDLTest_CommonEvent(state, &event, &done);
         }
         for (i = 0; i < state->num_windows; ++i) {
+            if (state->windows[i] == NULL)
+                continue;
             status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
             if (status) {
                 SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());