From cd9e274cca3e8b1f1db7e399e69924876fe9957d Mon Sep 17 00:00:00 2001
From: asiekierka <asiekierka@gmail.com>
Date: Tue, 12 Jan 2016 17:59:11 +0100
Subject: [PATCH] fix #3157, fix #3166

---
 common/buildcraft/core/builders/BuildingItem.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/buildcraft/core/builders/BuildingItem.java b/common/buildcraft/core/builders/BuildingItem.java
index 5f1c5f4b..7508adc3 100755
--- a/common/buildcraft/core/builders/BuildingItem.java
+++ b/common/buildcraft/core/builders/BuildingItem.java
@@ -182,7 +182,7 @@ public class BuildingItem implements IBuildingItem, ISerializable {
 				context.world().playAuxSFXAtEntity(null, 2001,
 						destX, destY, destZ,
 						Block.getIdFromBlock(oldBlock) + (oldMeta << 12));
-			} else {
+			} else if (slotToBuild.stackConsumed != null) {
 				for (ItemStack s : slotToBuild.stackConsumed) {
 					if (s != null && !(s.getItem() instanceof ItemBlock && Block.getBlockFromItem(s.getItem()) instanceof BlockBuildTool)) {
 						InvUtils.dropItems(context.world(), s, destX, destY, destZ);