From 1002ca401613294db2ecc06ed35a575c483ce41b Mon Sep 17 00:00:00 2001
From: KennyTV <28825609+KennyTV@users.noreply.github.com>
Date: Wed, 11 Dec 2019 20:36:49 +0100
Subject: [PATCH] Fix biomedata on some custom Spigot versions

---
 .../packets/WorldPackets.java                 | 24 ++++++++++---------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/packets/WorldPackets.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/packets/WorldPackets.java
index 77cd2cf22..a3578e146 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/packets/WorldPackets.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_15to1_14_4/packets/WorldPackets.java
@@ -101,18 +101,20 @@ public class WorldPackets {
                         if (chunk.isGroundUp()) {
                             int[] biomeData = chunk.getBiomeData();
                             int[] newBiomeData = new int[1024];
-                            // Now in 4x4x4 areas - take the biome of each "middle"
-                            for (int i = 0; i < 4; ++i) {
-                                for (int j = 0; j < 4; ++j) {
-                                    int x = (j << 2) + 2;
-                                    int z = (i << 2) + 2;
-                                    int oldIndex = (z << 4 | x);
-                                    newBiomeData[i << 2 | j] = biomeData[oldIndex];
+                            if (biomeData != null) {
+                                // Now in 4x4x4 areas - take the biome of each "middle"
+                                for (int i = 0; i < 4; ++i) {
+                                    for (int j = 0; j < 4; ++j) {
+                                        int x = (j << 2) + 2;
+                                        int z = (i << 2) + 2;
+                                        int oldIndex = (z << 4 | x);
+                                        newBiomeData[i << 2 | j] = biomeData[oldIndex];
+                                    }
+                                }
+                                // ... and copy it to the new y layers
+                                for (int i = 1; i < 64; ++i) {
+                                    System.arraycopy(newBiomeData, 0, newBiomeData, i * 16, 16);
                                 }
-                            }
-                            // ... and copy it to the new y layers
-                            for (int i = 1; i < 64; ++i) {
-                                System.arraycopy(newBiomeData, 0, newBiomeData, i * 16, 16);
                             }
 
                             chunk.setBiomeData(newBiomeData);