Crash on loading world after setting up water network

[Vectrobe]

Issue type:

• 🐛 Bug

---

Short description:

After setting up a pair of networks that transport water, the game immediately crashes upon loading the world;
"java.lang.NullPointerException: Cannot invoke "org.cyclops.integrateddynamics.api.network.IPartNetwork.hasPartVariable(int, org.cyclops.integrateddynamics.api.part.aspect.IAspectRead)" because "partNetwork" is null"

Steps to reproduce the problem:

unknown?

Expected behaviour:

---

Versions:

• This mod: 1.30.3
• Minecraft: 1.21.1
• Mod loader version: neo 21.1.217

Log file:

crash-2026-01-08_00.52.33-server.txt

[rubensworks]

Thanks for reporting!

[Vectrobe]

actually one catch by the looks of it, is it specifically a facade thats crashing? if so that would be very odd as the only two networks I recently made and changed, do not have facades

[rubensworks]

Seems unrelated to facades.

I don't see how that crash could be happening though.
Is there really no way you can provide steps to reproduce the problem?

[Vectrobe]

ok this seems like a form of continuation of #1571 where entire networks just fail to start correctly on world load, for completely unknown reasons and at complete random, which of course points to some form of race condition...

this network now after the crash, while the world does load again, the network itself is completely toasted, every component is broken and locked in a weird nonsensical state

and uh... apparently when I attempted to diagnose with a network reader, it placed the reader, and then duplicated the same reader in my hand, followed then by the network sporadically coming back to life??

[rubensworks]

I suspect there's some chunk corruption going on.
Can you try adding/breaking a single cable to reset the network?

[Vectrobe]

ok it is also specifically this network that triggers the crash
block reader on hose pulley, set to read a boolean tag of "Infinite", a small chain of logic that returns a conditional of water or empty fluid type, this is then sent to a proxy where output goes to that display and 8 fluid exports to the tank
additionally, the redstone input directly feeds the fluid filter attached to the hose pulley port via "redstone high"

the unique variable with this network compared to all others is the use of a fluid filter node, I did test this in a blank world but wasn't able to replicate the crash yet

[Jack-McKalling]

If you cannot reproduce the problem, another way of finding the trigger is to delete stuff you know probably doesn't contribute to the issue, and see when the crash starts to happen again or in fact doesn't anymore.

Of course I suggest doing this in a copy of your world for obvious reasons.

And once you get closer to the problem in your world, you can try reproducing it in a blank world.

[Vectrobe]

well, so I did end up replicating the crash, just not in the way I was expecting

I replicated a similar test network in the ID-only (plus create for the tanks) instance under the same conditions as the other issues, most specifically the world coordinates, but very specifically when I added the redstone high card to the fluid filter node, it instantly crashed there and then, as opposed to on a world load, which seems weird as the network didn't seem to be "null"??

so yea something wrong with fluid filter nodes

crash-2026-01-08_01.31.24-server.txt

mind you it didnt then crash on world load, but, pulling the redstone high card dumped this in the log;

[01:38:04] [Server thread/ERROR] [minecraft/ServerPacketListener]: Failed to handle packet net.minecraft.network.protocol.game.ServerboundContainerClickPacket@2af4a30e, suppressing error
net.minecraft.ReportedException: Container click
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.inventory.AbstractContainerMenu.clicked(AbstractContainerMenu.java:296) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B}
	at TRANSFORMER/cyclopscore@1.28.0/org.cyclops.cyclopscore.inventory.container.ContainerExtended.clicked(ContainerExtended.java:378) ~[cyclopscore-1.21.1-neoforge-1.28.0.jar%23200!/:1.28.0] {re:classloading}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.network.ServerGamePacketListenerImpl.handleContainerClick(ServerGamePacketListenerImpl.java:1673) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading,pl:accesstransformer:B}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.game.ServerboundContainerClickPacket.handle(ServerboundContainerClickPacket.java:71) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.game.ServerboundContainerClickPacket.handle(ServerboundContainerClickPacket.java:14) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:27) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.TickTask.run(TickTask.java:18) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:148) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,re:computing_frames,re:classloading}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:872) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:170) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:122) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:855) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:849) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:132) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.managedBlock(MinecraftServer.java:821) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:826) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:712) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:267) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] {}
Caused by: java.lang.NullPointerException: Cannot invoke "org.cyclops.integrateddynamics.api.network.INetwork.getCapability(org.cyclops.integrateddynamics.api.network.NetworkCapability)" because "network" is null
	at TRANSFORMER/integratedtunnels@1.9.2/org.cyclops.integratedtunnels.core.part.IPartTypeInterfacePositionedAddon.removePositionFromNetwork(IPartTypeInterfacePositionedAddon.java:65) ~[integratedtunnels-1.21.1-neoforge-1.9.2-521.jar%23205!/:1.9.2] {re:classloading}
	at TRANSFORMER/integratedtunnels@1.9.2/org.cyclops.integratedtunnels.part.aspect.TunnelAspectWriteBuilders$2.onDeactivate(TunnelAspectWriteBuilders.java:195) ~[integratedtunnels-1.21.1-neoforge-1.9.2-521.jar%23205!/:1.9.2] {re:classloading}
	at TRANSFORMER/integrateddynamics@1.30.3/org.cyclops.integrateddynamics.core.part.aspect.build.AspectBuilder$BuiltWriter.onDeactivate(AspectBuilder.java:422) ~[integrateddynamics-1.21.1-neoforge-1.30.3.jar%23202!/:1.30.3] {re:classloading}
	at TRANSFORMER/integrateddynamics@1.30.3/org.cyclops.integrateddynamics.core.part.write.PartStateWriterBase.triggerAspectInfoUpdate(PartStateWriterBase.java:87) ~[integrateddynamics-1.21.1-neoforge-1.30.3.jar%23202!/:1.30.3] {re:classloading}
	at TRANSFORMER/integrateddynamics@1.30.3/org.cyclops.integrateddynamics.core.part.write.PartTypeWriteBase.updateActivation(PartTypeWriteBase.java:166) ~[integrateddynamics-1.21.1-neoforge-1.30.3.jar%23202!/:1.30.3] {re:classloading}
	at TRANSFORMER/integrateddynamics@1.30.3/org.cyclops.integrateddynamics.inventory.container.ContainerPartWriter.onDirty(ContainerPartWriter.java:111) ~[integrateddynamics-1.21.1-neoforge-1.30.3.jar%23202!/:1.30.3] {re:classloading}
	at TRANSFORMER/cyclopscore@1.28.0/org.cyclops.cyclopscore.inventory.SimpleInventory.setChanged(SimpleInventory.java:244) ~[cyclopscore-1.21.1-neoforge-1.28.0.jar%23200!/:1.28.0] {re:classloading}
	at TRANSFORMER/cyclopscore@1.28.0/org.cyclops.cyclopscore.inventory.SimpleInventory.onInventoryChanged(SimpleInventory.java:144) ~[cyclopscore-1.21.1-neoforge-1.28.0.jar%23200!/:1.28.0] {re:classloading}
	at TRANSFORMER/cyclopscore@1.28.0/org.cyclops.cyclopscore.inventory.SimpleInventory.setItem(SimpleInventory.java:135) ~[cyclopscore-1.21.1-neoforge-1.28.0.jar%23200!/:1.28.0] {re:classloading}
	at TRANSFORMER/cyclopscore@1.28.0/org.cyclops.cyclopscore.inventory.SimpleInventory.removeItem(SimpleInventory.java:118) ~[cyclopscore-1.21.1-neoforge-1.28.0.jar%23200!/:1.28.0] {re:classloading}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.inventory.Slot.remove(Slot.java:88) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading,pl:accesstransformer:B}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.inventory.Slot.tryRemove(Slot.java:138) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading,pl:accesstransformer:B}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.inventory.AbstractContainerMenu.doClick(AbstractContainerMenu.java:412) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B}
	at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.inventory.AbstractContainerMenu.clicked(AbstractContainerMenu.java:286) ~[client-1.21.1-20240808.144430-srg.jar%23196!/:?] {re:classloading,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B}
	... 19 more

[Vectrobe]

ok well i guess the network is also toasted, unsurprisingly

[rubensworks]

Do you see anything else showing up in your logs (besides the crash)?
I would suspect there are some warnings from ID mentioning unavailable or corrupted networks.

[rubensworks]

Could you share the world + mods with that minimal reproducible instance, right before the crash (and instructions on how to make it crash)?