From 8196385438caa45aef6ddd2dbae26a431d704268 Mon Sep 17 00:00:00 2001
From: Giles Bathgate <gilesbathgate@gmail.com>
Date: Sun, 14 Aug 2011 20:57:46 +0100
Subject: Fix for crash caused by 0-sized square as reported by chrysn.


diff --git a/src/primitives.cc b/src/primitives.cc
index 5180c16..45b2da3 100644
--- a/src/primitives.cc
+++ b/src/primitives.cc
@@ -434,7 +434,7 @@ sphere_next_r2:
 		}
 	}
 
-	if (type == SQUARE)
+	if (type == SQUARE && x > 0 && y > 0)
 	{
 		double x1, x2, y1, y2;
 		if (center) {
-- 
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