PaperMC/patches/server/0082-Do-not-load-chunks-for-Pathfinding.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 31 Mar 2016 19:17:58 -0400
Subject: [PATCH] Do not load chunks for Pathfinding


diff --git a/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java b/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
index 4aa04a2805c6b8e124112467e0ece3ac4cf80324..67ac0b3cec3b1a9bd6de7be50244804ac1620ab3 100644
--- a/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
+++ b/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
@@ -457,7 +457,12 @@ public class WalkNodeEvaluator extends NodeEvaluator {
                 for(int n = -1; n <= 1; ++n) {
                     if (l != 0 || n != 0) {
                         pos.set(i + l, j + m, k + n);
-                        BlockState blockState = world.getBlockState(pos);
+                        // Paper start
+                        BlockState blockState = world.getBlockStateIfLoaded(pos);
+                        if (blockState == null) {
+                            return BlockPathTypes.BLOCKED;
+                        } else {
+                        // Paper end
                         if (blockState.is(Blocks.CACTUS) || blockState.is(Blocks.SWEET_BERRY_BUSH)) {
                             return BlockPathTypes.DANGER_OTHER;
                         }
@@ -469,6 +474,7 @@ public class WalkNodeEvaluator extends NodeEvaluator {
                         if (world.getFluidState(pos).is(FluidTags.WATER)) {
                             return BlockPathTypes.WATER_BORDER;
                         }
+                        } // Paper
                     }
                 }
             }
@@ -478,7 +484,8 @@ public class WalkNodeEvaluator extends NodeEvaluator {
     }
 
     protected static BlockPathTypes getBlockPathTypeRaw(BlockGetter world, BlockPos pos) {
-        BlockState blockState = world.getBlockState(pos);
+        BlockState blockState = world.getBlockStateIfLoaded(pos); // Paper
+        if (blockState == null) return BlockPathTypes.BLOCKED; // Paper
         Block block = blockState.getBlock();
         Material material = blockState.getMaterial();
         if (blockState.isAir()) {