From 4b475d9fefdd6c1a4af1ea2499b0dcc70da3a1e2 Mon Sep 17 00:00:00 2001
From: SpaceToad <spacetoadcraft@gmail.com>
Date: Thu, 15 May 2014 22:22:49 +0200
Subject: [PATCH] fixed crash when removing prematurely removing blueprint from
 library, close #1812

---
 .../builders/TileBlueprintLibrary.java           | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/common/buildcraft/builders/TileBlueprintLibrary.java b/common/buildcraft/builders/TileBlueprintLibrary.java
index e139fb6e..52f1b78b 100644
--- a/common/buildcraft/builders/TileBlueprintLibrary.java
+++ b/common/buildcraft/builders/TileBlueprintLibrary.java
@@ -123,7 +123,21 @@ public class TileBlueprintLibrary extends TileBuildCraft implements IInventory {
 
 	@Override
 	public ItemStack decrStackSize(int i, int j) {
-		return inv.decrStackSize(i, j);
+		ItemStack result = inv.decrStackSize(i, j);
+
+		if (i == 0) {
+			if (getStackInSlot(0) == null) {
+				progressIn = 0;
+			}
+		}
+
+		if (i == 2) {
+			if (getStackInSlot(2) == null) {
+				progressOut = 0;
+			}
+		}
+
+		return result;
 	}
 
 	@Override