From aa8aee623adc74cbfe87f9e92e30be4a9ed3a7c8 Mon Sep 17 00:00:00 2001
From: Don Bright <hugh.m.bright@gmail.com>
Date: Mon, 28 May 2012 16:30:19 -0500
Subject: [PATCH] fix crash bug

---
 src/linearextrude.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/linearextrude.cc b/src/linearextrude.cc
index 28ca30a5..ccaa238c 100644
--- a/src/linearextrude.cc
+++ b/src/linearextrude.cc
@@ -78,8 +78,10 @@ AbstractNode *LinearExtrudeModule::evaluate(const Context *ctx, const ModuleInst
 	// if height not given, and first argument is a number,
 	// then assume it should be the height.
 	if ( c.lookup_variable("height").type == Value::UNDEFINED )
-		if ( inst->argnames[0] == "" )
-			height = inst->argvalues[0];
+		if ( inst->argnames.size()>0 )
+			if ( inst->argnames[0] == "" )
+				if ( inst->argvalues[0].type == Value::NUMBER )
+					height = Value(inst->argvalues[0]);
 
 	node->layername = layer.text;
 	node->height = height.num;