From ed3a32a91ab9d1d1880034e1e09de3d16c17ed4a Mon Sep 17 00:00:00 2001
From: Littleboy
Date: Fri, 15 May 2015 23:30:02 -0400
Subject: SDL: Check for NULL when listing available modes via SDL_ListModes

It can be returned when there are no dimensions available for the currently selected pixel format
---
 backends/graphics/openglsdl/openglsdl-graphics.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backends/graphics/openglsdl/openglsdl-graphics.cpp b/backends/graphics/openglsdl/openglsdl-graphics.cpp
index c71b9c9219..53868b86d8 100644
--- a/backends/graphics/openglsdl/openglsdl-graphics.cpp
+++ b/backends/graphics/openglsdl/openglsdl-graphics.cpp
@@ -57,7 +57,7 @@ OpenGLSdlGraphicsManager::OpenGLSdlGraphicsManager(uint desktopWidth, uint deskt
 	}
 #else
 	const SDL_Rect *const *availableModes = SDL_ListModes(NULL, SDL_OPENGL | SDL_FULLSCREEN);
-	if (availableModes != (void *)-1) {
+	if (availableModes != NULL && availableModes != (void *)-1) {
 		for (;*availableModes; ++availableModes) {
 			const SDL_Rect *mode = *availableModes;
 
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