From 757820fe1c67290328c77802ea7718505b77f437 Mon Sep 17 00:00:00 2001
From: Justin C <charetjc@gmail.com>
Date: Sat, 2 Feb 2013 02:11:42 -0800
Subject: missing NULL check when normalization exceeds limit for elements


diff --git a/src/csgtermnormalizer.cc b/src/csgtermnormalizer.cc
index e2474e9..81fab80 100644
--- a/src/csgtermnormalizer.cc
+++ b/src/csgtermnormalizer.cc
@@ -20,7 +20,7 @@ shared_ptr<CSGTerm> CSGTermNormalizer::normalize(const shared_ptr<CSGTerm> &root
 			PRINTB("WARNING: Normalized tree is growing past %d elements. Aborting normalization.\n", this->limit);
       // Clean up any partially evaluated terms
 			shared_ptr<CSGTerm> newroot = root, tmproot;
-			while (newroot != tmproot) {
+			while (newroot && newroot != tmproot) {
 				tmproot = newroot;
 				newroot = collapse_null_terms(tmproot);
 			}
-- 
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