From e9ad3720390fe8a124289a99a4b95004fb039b66 Mon Sep 17 00:00:00 2001
From: Myles <myles@myles.us>
Date: Sun, 29 Jul 2018 11:48:38 +0100
Subject: [PATCH] Remap negative ids to air (workaround for #933)

---
 .../protocol1_13to1_12_2/packets/WorldPackets.java         | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/WorldPackets.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/WorldPackets.java
index c31b47278..20d59fc34 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/WorldPackets.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/packets/WorldPackets.java
@@ -14,8 +14,6 @@ import us.myles.ViaVersion.api.remapper.PacketHandler;
 import us.myles.ViaVersion.api.remapper.PacketRemapper;
 import us.myles.ViaVersion.api.type.Type;
 import us.myles.ViaVersion.packets.State;
-import us.myles.ViaVersion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
-import us.myles.ViaVersion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.data.MappingData;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.data.Particle;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.data.ParticleRewriter;
@@ -23,6 +21,8 @@ import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.providers.BlockEntityP
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.providers.PaintingProvider;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.storage.BlockStorage;
 import us.myles.ViaVersion.protocols.protocol1_13to1_12_2.types.Chunk1_13Type;
+import us.myles.ViaVersion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
+import us.myles.ViaVersion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
 
 import java.util.List;
 
@@ -276,6 +276,9 @@ public class WorldPackets {
     }
 
     public static int toNewId(int oldId) {
+        if (oldId < 0) {
+            oldId = 0; // Some plugins use negative numbers to clear blocks, remap them to air.
+        }
         Integer newId = MappingData.blockMappings.getNewBlock(oldId);
         if (newId != null) {
             return newId;