From af66f8ebae0add1b49878392d1d767590598ebf2 Mon Sep 17 00:00:00 2001
From: "madmaxoft@gmail.com"
 <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>
Date: Thu, 20 Dec 2012 13:56:42 +0000
Subject: Fixed a crash in redstone simulator when destroying blocks in Y < 2

git-svn-id: http://mc-server.googlecode.com/svn/trunk@1084 0a769ca7-a7f5-676a-18bf-c427514a06d6
---
 source/Simulator/RedstoneSimulator.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/source/Simulator/RedstoneSimulator.cpp b/source/Simulator/RedstoneSimulator.cpp
index afc5cca3d..2224d300d 100644
--- a/source/Simulator/RedstoneSimulator.cpp
+++ b/source/Simulator/RedstoneSimulator.cpp
@@ -456,6 +456,10 @@ int cRedstoneSimulator::UnPowerBlock( const Vector3i & a_BlockPos, const Vector3
 {
 	BLOCKTYPE BlockType;
 	NIBBLETYPE BlockMeta;
+	if ((a_BlockPos.y < 0) || (a_BlockPos.y >= cChunkDef::Height))
+	{
+		return 0;
+	}
 	m_World->GetBlockTypeMeta(a_BlockPos.x, a_BlockPos.y, a_BlockPos.z, BlockType, BlockMeta);
 	switch (BlockType)
 	{
-- 
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