From 054b4110d73c8ac713332b44f9b7db62a1c2d13d Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Fri, 14 Jun 2013 14:24:08 -0400
Subject: Added assert for issue #403


diff --git a/src/csgterm.cc b/src/csgterm.cc
index 7852715..a0379e7 100644
--- a/src/csgterm.cc
+++ b/src/csgterm.cc
@@ -188,6 +188,7 @@ void CSGChain::import(shared_ptr<CSGTerm> term, CSGTerm::type_e type, CSGTerm::F
 	if (term->type == CSGTerm::TYPE_PRIMITIVE) {
 		this->objects.push_back(CSGChainObject(term->polyset, term->m, term->color, type, term->label, newflag));
 	} else {
+		assert(term->left && term->right);
 		import(term->left, type, newflag);
 		import(term->right, term->type, newflag);
 	}
-- 
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