From b2ffa4ad258408e863f989014361e286f3679fcf Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 17 Apr 2016 17:27:09 -0400
Subject: [PATCH] Prevent Fire from loading chunks

This causes the nether to spam unload/reload chunks, plus overall
bad behavior.

diff --git a/src/main/java/net/minecraft/server/BlockFire.java b/src/main/java/net/minecraft/server/BlockFire.java
index 8645a0ebd0..f769df41a6 100644
--- a/src/main/java/net/minecraft/server/BlockFire.java
+++ b/src/main/java/net/minecraft/server/BlockFire.java
@@ -163,6 +163,7 @@ public class BlockFire extends Block {
                                 }
 
                                 blockposition_mutableblockposition.g(blockposition).e(l, j1, i1);
+                                if (!world.isLoaded(blockposition_mutableblockposition)) continue; // Paper
                                 int l1 = this.a((IWorldReader) world, (BlockPosition) blockposition_mutableblockposition);
 
                                 if (l1 > 0) {
@@ -208,10 +209,16 @@ public class BlockFire extends Block {
     }
 
     private void a(World world, BlockPosition blockposition, int i, Random random, int j, BlockPosition sourceposition) { // CraftBukkit add sourceposition
-        int k = this.q(world.getType(blockposition));
+        // Paper start
+        final IBlockData iblockdata = world.getTypeIfLoaded(blockposition);
+        if (iblockdata == null) {
+            return;
+        }
+        int k = this.q(iblockdata);
+        // Paper end
 
         if (random.nextInt(i) < k) {
-            IBlockData iblockdata = world.getType(blockposition);
+            //IBlockData iblockdata = world.getType(blockposition); // Paper
 
             // CraftBukkit start
             org.bukkit.block.Block theBlock = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
@@ -269,8 +276,12 @@ public class BlockFire extends Block {
 
             for (int k = 0; k < j; ++k) {
                 EnumDirection enumdirection = aenumdirection[k];
-                IBlockData iblockdata = iworldreader.getType(blockposition.shift(enumdirection));
-
+                // Paper start
+                IBlockData iblockdata = iworldreader.getTypeIfLoaded(blockposition.shift(enumdirection));
+                if (iblockdata == null) {
+                    continue;
+                }
+                // Paper end
                 i = Math.max(this.r(iblockdata), i);
             }
 
-- 
2.21.0