From 0f49186bf57f4e4293af30c6852df06853526965 Mon Sep 17 00:00:00 2001
From: sk89q <the.sk89q@gmail.com>
Date: Thu, 18 Oct 2012 23:12:53 -0700
Subject: [PATCH] Fixed reported bug that block #0 (air) is not considered
 valid.
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Fixed a reported bug that block #0 (air) is not considered valid. Also set skipNmsValidBlockCheck to true if the check fails (as I assume was originally intended).
---
 src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java b/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
index 18a2fe431..ad1138023 100644
--- a/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
+++ b/src/main/java/com/sk89q/worldedit/bukkit/BukkitWorld.java
@@ -869,10 +869,11 @@ public class BukkitWorld extends LocalWorld {
     public boolean isValidBlockType(int type) {
         if (!skipNmsValidBlockCheck) {
             try {
-                return type >=0 && type < net.minecraft.server.Block.byId.length
-                        && net.minecraft.server.Block.byId[type] != null;
+                return type == 0 || (type >= 1 && type < net.minecraft.server.Block.byId.length
+                        && net.minecraft.server.Block.byId[type] != null);
             } catch (Exception e) {
                 logger.log(Level.SEVERE, "Error checking NMS valid block type", e);
+                skipNmsValidBlockCheck = true;
             }
         }
         return Material.getMaterial(type) != null && Material.getMaterial(type).isBlock();