From 1ca3b4fcfc301b5dbf685d5a5fcadb65fecc2e32 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 10 Sep 2018 23:56:36 -0400
Subject: [PATCH] Prevent Mob AI Rules from Loading Chunks


diff --git a/src/main/java/net/minecraft/server/PathfinderGoalRemoveBlock.java b/src/main/java/net/minecraft/server/PathfinderGoalRemoveBlock.java
index b1661693cf..2cbb6c8f91 100644
--- a/src/main/java/net/minecraft/server/PathfinderGoalRemoveBlock.java
+++ b/src/main/java/net/minecraft/server/PathfinderGoalRemoveBlock.java
@@ -7,11 +7,13 @@ public class PathfinderGoalRemoveBlock extends PathfinderGoalGotoTarget {
     private final Block f;
     private final EntityInsentient g;
     private int h;
+    private World world; // Paper
 
     public PathfinderGoalRemoveBlock(Block block, EntityCreature entitycreature, double d0, int i) {
         super(entitycreature, d0, 24, i);
         this.f = block;
         this.g = entitycreature;
+        this.world = entitycreature.world; // Paper
     }
 
     public boolean a() {
@@ -89,13 +91,15 @@ public class PathfinderGoalRemoveBlock extends PathfinderGoalGotoTarget {
 
     @Nullable
     private BlockPosition a(BlockPosition blockposition, IBlockAccess iblockaccess) {
-        if (iblockaccess.getType(blockposition).getBlock() == this.f) {
+        Block block = world.getBlockIfLoaded(blockposition); // Paper
+        if (block == null) return null; // Paper
+        if (block == this.f) { // Paper
             return blockposition;
         } else {
             BlockPosition[] ablockposition = new BlockPosition[]{blockposition.down(), blockposition.west(), blockposition.east(), blockposition.north(), blockposition.south(), blockposition.down().down()};
 
             for(BlockPosition blockposition1 : ablockposition) {
-                if (iblockaccess.getType(blockposition1).getBlock() == this.f) {
+                if (world.getBlockIfLoaded(blockposition1) == this.f) { // Paper
                     return blockposition1;
                 }
             }
@@ -105,7 +109,8 @@ public class PathfinderGoalRemoveBlock extends PathfinderGoalGotoTarget {
     }
 
     protected boolean a(IWorldReader iworldreader, BlockPosition blockposition) {
-        Block block = iworldreader.getType(blockposition).getBlock();
+        Block block = world.getBlockIfLoaded(blockposition); // Paper
+        if (block == null) return false; // Paper
         return block == this.f && iworldreader.getType(blockposition.up()).isAir() && iworldreader.getType(blockposition.up(2)).isAir();
     }
 }
-- 
2.18.0