From 7c5ed4781f222f312e179878e076f81ab61f3384 Mon Sep 17 00:00:00 2001
From: Acrobot <andrzejp@dysleksja.pl>
Date: Sun, 27 Oct 2013 16:51:01 +0100
Subject: [PATCH] Add a prevention from IOUB-exceptions

---
 .../Acrobot/ChestShop/Listeners/Block/Break/SignBreak.java | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/main/java/com/Acrobot/ChestShop/Listeners/Block/Break/SignBreak.java b/src/main/java/com/Acrobot/ChestShop/Listeners/Block/Break/SignBreak.java
index 7bc3272f..1b7f8a5d 100644
--- a/src/main/java/com/Acrobot/ChestShop/Listeners/Block/Break/SignBreak.java
+++ b/src/main/java/com/Acrobot/ChestShop/Listeners/Block/Break/SignBreak.java
@@ -26,6 +26,7 @@ import org.bukkit.event.entity.EntityExplodeEvent;
 import org.bukkit.material.Directional;
 import org.bukkit.material.PistonBaseMaterial;
 import org.bukkit.metadata.FixedMetadataValue;
+import org.bukkit.metadata.MetadataValue;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -58,6 +59,12 @@ public class SignBreak implements Listener {
         Block attachedBlock = BlockUtil.getAttachedFace(sign);
 
         if (attachedBlock.getType() == Material.AIR && ChestShopSign.isValid(sign)) {
+            List <MetadataValue> values = block.getMetadata(METADATA_NAME);
+
+            if (values.size() < 1) {
+                return;
+            }
+
             sendShopDestroyedEvent(sign, (Player) block.getMetadata(METADATA_NAME).get(0).value());
         }
     }