[Bug] Mod does not work on lan worlds

Version Info

Minecraft, 1.20.4
Pottery 1.0.0

What mod loader are you using?: Forge

Description of the Bug Pottery does not work with lan worlds. The client joining the world will be kicked with the NPE down below.

Steps to Reproduce

Open two clients
Create a world and open to lan
Join said lan world with another client
See that you've been kicked

Log snippet

[19:33:11] [Netty Server IO #3/ERROR] [minecraft/PacketEncoder]: Error receiving packet 115
java.lang.NullPointerException: Cannot invoke "net.minecraft.resources.ResourceLocation.toString()" because "p_130086_" is null
    at net.minecraft.network.FriendlyByteBuf.m_130085_(FriendlyByteBuf.java:642) ~[forge-1.20.4-49.0.14-client.jar:?] {re:classloading}
    at net.minecraft.network.protocol.game.ClientboundUpdateRecipesPacket.m_179469_(ClientboundUpdateRecipesPacket.java:52) ~[forge-1.20.4-49.0.14-client.jar:?] {re:classloading}
    at net.minecraft.network.FriendlyByteBuf.m_236828_(FriendlyByteBuf.java:208) ~[forge-1.20.4-49.0.14-client.jar:?] {re:classloading}
    at net.minecraft.network.protocol.game.ClientboundUpdateRecipesPacket.m_5779_(ClientboundUpdateRecipesPacket.java:28) ~[forge-1.20.4-49.0.14-client.jar:?] {re:classloading}
    at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:47) ~[forge-1.20.4-49.0.14-client.jar:?] {re:classloading}
    at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:15) ~[forge-1.20.4-49.0.14-client.jar:?] {re:classloading}
    at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:940) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1025) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:306) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] {}
    at net.minecraft.network.Connection.m_243087_(Connection.java:297) ~[forge-1.20.4-49.0.14-client.jar:?] {re:classloading}
    at net.minecraft.network.Connection.m_292120_(Connection.java:290) ~[forge-1.20.4-49.0.14-client.jar:?] {re:classloading}
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.97.Final.jar!/:4.1.97.Final] {}
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.97.Final.jar!/:4.1.97.Final] {}
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.97.Final.jar!/:4.1.97.Final] {}
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569) ~[netty-transport-4.1.97.Final.jar!/:4.1.97.Final] {}
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.97.Final.jar!/:4.1.97.Final] {}
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.97.Final.jar!/:4.1.97.Final] {}
    at java.lang.Thread.run(Thread.java:833) ~[?:?] {}

SuperMartijn642 / Pottery

[Bug] Mod does not work on lan worlds #2