diff --git a/common/src/main/java/us/myles/ViaVersion/api/protocol/Protocol.java b/common/src/main/java/us/myles/ViaVersion/api/protocol/Protocol.java
index 1b79569bf..3ca1d4745 100644
--- a/common/src/main/java/us/myles/ViaVersion/api/protocol/Protocol.java
+++ b/common/src/main/java/us/myles/ViaVersion/api/protocol/Protocol.java
@@ -98,8 +98,14 @@ public abstract class Protocol {
      * @param packetRemapper The remapper to use for the packet
      */
     public void registerIncoming(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper) {
+        registerIncoming(state, oldPacketID, newPacketID, packetRemapper, false);
+    }
+
+    public void registerIncoming(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper, boolean override) {
         ProtocolPacket protocolPacket = new ProtocolPacket(state, oldPacketID, newPacketID, packetRemapper);
-        incoming.put(new Pair<>(state, newPacketID), protocolPacket);
+        Pair<State, Integer> pair = new Pair<>(state, newPacketID);
+        if (!override && incoming.containsKey(pair)) throw new IllegalArgumentException(pair + " already registered");
+        incoming.put(pair, protocolPacket);
     }
 
     /**
@@ -122,8 +128,14 @@ public abstract class Protocol {
      * @param packetRemapper The remapper to use for the packet
      */
     public void registerOutgoing(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper) {
+        registerOutgoing(state, oldPacketID, newPacketID, packetRemapper, false);
+    }
+
+    public void registerOutgoing(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper, boolean override) {
         ProtocolPacket protocolPacket = new ProtocolPacket(state, oldPacketID, newPacketID, packetRemapper);
-        outgoing.put(new Pair<>(state, oldPacketID), protocolPacket);
+        Pair<State, Integer> pair = new Pair<>(state, oldPacketID);
+        if (!override && outgoing.containsKey(pair)) throw new IllegalArgumentException(pair + " already registered");
+        outgoing.put(pair, protocolPacket);
     }
 
     /**
diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/Protocol1_13To1_12_2.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/Protocol1_13To1_12_2.java
index 0792f2546..55e903013 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/Protocol1_13To1_12_2.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/Protocol1_13To1_12_2.java
@@ -344,7 +344,6 @@ public class Protocol1_13To1_12_2 extends Protocol {
         registerOutgoing(State.PLAY, 0x1B, 0x1C);
         // New packet 0x1D - NBT Query
         registerOutgoing(State.PLAY, 0x1C, 0x1E);
-        registerOutgoing(State.PLAY, 0x1D, 0x1F);
         registerOutgoing(State.PLAY, 0x1E, 0x20);
         registerOutgoing(State.PLAY, 0x1F, 0x21);
         // WorldPackets 0x20 -> 0x22
diff --git a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/packets/PlayerPackets.java b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/packets/PlayerPackets.java
index af823f1c7..37f9439f5 100644
--- a/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/packets/PlayerPackets.java
+++ b/common/src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/packets/PlayerPackets.java
@@ -392,19 +392,6 @@ public class PlayerPackets {
 
         /* Removed packets */
 
-        // Map Bulk
-        protocol.registerOutgoing(State.PLAY, 0x26, 0x26, new PacketRemapper() {
-            @Override
-            public void registerMap() {
-                handler(new PacketHandler() {
-                    @Override
-                    public void handle(PacketWrapper wrapper) throws Exception {
-                        wrapper.cancel();
-                    }
-                });
-            }
-        });
-
         // Set Compression
         protocol.registerOutgoing(State.PLAY, 0x46, 0x46, new PacketRemapper() {
             @Override