PaperMC/CraftBukkit-Patches/0017-Prevent-NPE-in-CraftSign.patch

From 6d7b55496c097214f4bdb2acdee1b08c8767d2ad Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Mon, 18 Mar 2013 20:01:44 +1100
Subject: [PATCH] Prevent NPE in CraftSign

This commit prevents the constructor of CraftSign throwing an NPE when it cannot get the sign tile entity. Instead it will fallback to a 4 empty lined sign, and not try to do anything to those lines on .update().

diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java b/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
index 42a6f9a..43adfcc 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
@@ -18,6 +18,12 @@ public class CraftSign extends CraftBlockState implements Sign {
 
         CraftWorld world = (CraftWorld) block.getWorld();
         sign = (TileEntitySign) world.getTileEntityAt(getX(), getY(), getZ());
+        // Spigot start
+        if (sign == null) {
+            lines = new String[]{"", "", "", ""};
+            return;
+        }
+        // Spigot end
         lines = new String[sign.lines.length];
         System.arraycopy(revertComponents(sign.lines), 0, lines, 0, lines.length);
     }
-- 
2.1.4