Server error spam and crash when opening Easy Mob Farm GUI with Ledger installed

[suerion]

Expected behavior

Opening an Easy Mob Farm block GUI should work normally, and leaving the server afterward should not crash the server.

Observed/actual behavior

When a player accesses an Easy Mob Farm block, Ledger throws a NullPointerException while logging container changes.

At first, the server logs/spams the error when interacting with the Mob Farm GUI. If the player then leaves/disconnects from the server, the server crashes with the same Ledger-related error.

Crash log:
https://mclo.gs/qadnH0q

Previous server log:
https://mclo.gs/mxikjtR

Steps/models to reproduce

Install Ledger and Easy Mob Farm on a Fabric server.
Place or use an Easy Mob Farm block.
Right-click / access the Mob Farm block GUI.
Check the server console/log.
The server logs the Ledger NullPointerException.
Leave/disconnect from the server.
The server crashes with the same error.

What operating system are you running

Linux

Minecraft version

26.1.2

Ledger version

1.3.22

Logs

https://mclo.gs/mxikjtR

Agreements

• I am running the latest version of the mod.
• My version of Minecraft is supported.
• I have searched for and ensured there isn't already an open issue regarding this.

Other

Related mods:
Ledger: https://modrinth.com/mod/ledger
Easy Mob Farm: https://modrinth.com/mod/easy-mob-farm

Relevant crash excerpt:

java.lang.NullPointerException: Cannot invoke "java.lang.Integer.intValue()" because the return value of "java.util.Map.get(Object)" is null
	at knot//net.minecraft.world.inventory.AbstractContainerMenu.handler$eaa000$ledger$ledgerCloseScreenLogChanges(AbstractContainerMenu.java:1989)
	at knot//net.minecraft.world.inventory.AbstractContainerMenu.removed(AbstractContainerMenu.java:624)
	at knot//net.minecraft.server.level.ServerPlayer.doCloseContainer(MixinServerPlayer.java:1501)
	at knot//net.minecraft.world.entity.player.Player.remove(Player.java:1328)
	at knot//net.minecraft.server.level.ServerLevel.removePlayerImmediately(MixinServerLevel.java:1039)
	at knot//net.minecraft.server.players.PlayerList.remove(MixinPlayerList.java:335)
	at knot//net.minecraft.server.network.ServerGamePacketListenerImpl.removePlayerFromWorld(ServerGamePacketListenerImpl.java:1558)
	at knot//net.minecraft.server.network.ServerGamePacketListenerImpl.onDisconnect(ServerGamePacketListenerImpl.java:1547)
	at knot//net.minecraft.network.Connection.handleDisconnection(Connection.java:629)
	at knot//net.minecraft.server.network.ServerConnectionListener.tick(ServerConnectionListener.java:162)
	at knot//net.minecraft.server.MinecraftServer.tickConnection(MinecraftServer.java:1180)
	at knot//net.minecraft.server.dedicated.DedicatedServer.tickConnection(DedicatedServer.java:453)
	at knot//net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1149)
	at knot//net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1002)
	at knot//net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:322)
	at knot//net.minecraft.server.MinecraftServer.processPacketsAndTick(MinecraftServer.java:1035)
	at knot//net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:774)
	at knot//net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:321)
	at java.base/java.lang.Thread.run(Thread.java:1474)