EnderStorage 2.11.0.188 Server Crash

[Puppydaze]

Minecraft 1.20.1
EnderStorage 2.11.0.188
Forge 1.20.1-47.4.8
Java 21.0.8.9 Eclipse Adoptium

Server is becoming extremely overloaded over a period of a minute (after being up for about 10 or 20 minutes), and then crashing with the following spammed in console:

[12:16:26] [Server thread/ERROR] [co.li.pa.PacketCustomChannelBuilder/]: Error handling packet on channel enderstorage:network.
java.lang.NullPointerException: Cannot invoke "codechicken.enderstorage.network.TankSynchroniser$PlayerItemTankCache.handleVisiblityPacket(codechicken.lib.packet.PacketCustom)" because the return value of "java.util.Map.get(Object)" is null
        at codechicken.enderstorage.network.TankSynchroniser.handleVisiblityPacket(TankSynchroniser.java:230) ~[EnderStorage-1.20.1-2.11.0.188-universal.jar%23521!/:1.20.1-2.11.0.188] {re:classloading}
        at codechicken.enderstorage.network.EnderStorageSPH.handlePacket(EnderStorageSPH.java:18) ~[EnderStorage-1.20.1-2.11.0.188-universal.jar%23521!/:1.20.1-2.11.0.188] {re:classloading}
        at codechicken.lib.packet.PacketCustomChannelBuilder$ServerHandler.lambda$onServerPayload$0(PacketCustomChannelBuilder.java:232) ~[CodeChickenLib-1.20.1-4.4.0.516-universal.jar%23476!/:4.4.0.516] {re:classloading,pl:eventbus:A}
        at net.minecraft.util.thread.BlockableEventLoop.m_18693_(BlockableEventLoop.java:67) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
        at java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source) ~[?:?] {}
        at net.minecraft.server.TickTask.run(TickTask.java:18) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:classloading,re:mixin}
        at net.minecraft.util.thread.BlockableEventLoop.m_6367_(BlockableEventLoop.java:156) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
        at net.minecraft.util.thread.ReentrantBlockableEventLoop.m_6367_(ReentrantBlockableEventLoop.java:23) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,re:computing_frames,re:classloading}
        at net.minecraft.server.MinecraftServer.m_6367_(MinecraftServer.java:770) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_6367_(MinecraftServer.java:161) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
        at net.minecraft.util.thread.BlockableEventLoop.m_7245_(BlockableEventLoop.java:130) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
        at net.minecraft.server.MinecraftServer.m_129961_(MinecraftServer.java:753) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_7245_(MinecraftServer.java:747) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
        at net.minecraft.util.thread.BlockableEventLoop.m_18699_(BlockableEventLoop.java:115) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
        at net.minecraft.server.MinecraftServer.m_130012_(MinecraftServer.java:732) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:665) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[server-1.20.1-20230612.114412-srg.jar%23741!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
        at java.lang.Thread.run(Unknown Source) ~[?:?] {re:mixin}

After that spams for a while, this appears in its place:

[12:16:32] [Server thread/ERROR] [co.li.pa.PacketCustomChannelBuilder/]: Error handling packet on channel enderstorage:network.
java.lang.NullPointerException: null

and after that, it stays frozen until I force quit it.

The only ender storage item on our server (as far as i 'm aware) is one ender chest and one ender tank. Both get emptied quickly.

[Puppydaze]

I see this was apparently fixed in 1.21.1, but wasn't fixed in 1.20.1. I would understand if a fix isn't planned, but I'd like to know how to avoid this crash at the very least.