[1.12.2] Unable to join at first startup.

[AoiKagase]

This response raises a NullPointerException and cannot join the server.
(Occurs in ImmersiveRailroading.)
fabdb31
It seems that World.get(internal.world).getEntity(internal) is null.

[Goldenfield192]

Please leave comments here instead of starting a new thread

[AoiKagase]

Here is the log of what happened.

java.lang.NullPointerException: Unexpected error
    at cam72cam.mod.MinecraftClient.getPlayer(MinecraftClient.java:27)
    at cam72cam.immersiverailroading.ImmersiveRailroading.lambda$clientEvent$3(ImmersiveRailroading.java:200)
    at cam72cam.mod.render.GlobalRender.lambda$registerOverlay$3(GlobalRender.java:89)
    at cam72cam.mod.event.ClientEvents$ClientEventBus.lambda$onOverlayEvent$6(ClientEvents.java:207)
    at java.lang.Iterable.forEach(Iterable.java:75)
    at cam72cam.mod.event.Event.execute(Event.java:24)
    at cam72cam.mod.event.ClientEvents$ClientEventBus.onOverlayEvent(ClientEvents.java:207)
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_534_ClientEventBus_onOverlayEvent_Pre.invoke(.dynamic)
    at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
    at com.github.terminatornl.laggoggles.tickcentral.EventBusTransformer.redirectEvent(EventBusTransformer.java:67)
    at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
    at net.minecraftforge.client.GuiIngameForge.pre(GuiIngameForge.java:907)
    at net.minecraftforge.client.GuiIngameForge.renderGameOverlay(GuiIngameForge.java:119)
    at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1098)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1119)
    at net.minecraft.client.Minecraft.run(Minecraft.java:5614)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:243)
    at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:278)
    at org.multimc.EntryPoint.listen(EntryPoint.java:143)
    at org.multimc.EntryPoint.main(EntryPoint.java:34)

[aking4125]

crash-2025-01-06_01.58.53-client.txt
We're getting similar issues upon logging in.

[D3nnis3n]

Is there a known workaround for this? Unfortunately the issue still happens.

//EDIT: The last working version is Immersive Railroading 1.9.1 with Universal Mod Core 1.1.4.

[Goldenfield192]

Is there a known workaround for this? Unfortunately the issue still happens.

//EDIT: The last working version is Immersive Railroading 1.9.1 with Universal Mod Core 1.1.4.

Could you try with this?

https://teamopenindustry.cc/maven/cam72cam/immersiverailroading/ImmersiveRailroading/1.12.2-forge-1.10.0-3d30827/ImmersiveRailroading-1.12.2-forge-1.10.0-3d30827.jar
https://teamopenindustry.cc/maven/cam72cam/universalmodcore/UniversalModCore/1.12.2-forge-1.2.3-ce99f5f/UniversalModCore-1.12.2-forge-1.2.3-ce99f5f.jar

[D3nnis3n]

Unfortunately that didn't help.

Here is my full crash log with these files:
crash-2026-02-26_06.55.42-client.txt

If you need any other information, let me kow. I'm also happy to test any other new builds, we're currently reviving our 1.12.2 modpack for another playthrough.

[Goldenfield192]

Unfortunately that didn't help.

Here is my full crash log with these files: crash-2026-02-26_06.55.42-client.txt

If you need any other information, let me kow. I'm also happy to test any other new builds, we're currently reviving our 1.12.2 modpack for another playthrough.

Could you try to do a binary search to find out the mod that causing this conflict? I'm away from my computer now

[D3nnis3n]

I tried around for about two hours but already had no success in the initial halving - both halves had the issue. I ultimately went as far as having an AI compare the mod list of my crash log and the mod list of the crash log posted further above, identified the about 160 overlapping mods and removed them all - but the issue persisted.

I'm going to check if one of the server side only mods might be the cause by removing those in the evening, but beyond that it seems I'm out of luck. Thankfully we can use 1.9.1 for the meanwhile.

[Goldenfield192]

I tried around for about two hours but already had no success in the initial halving - both halves had the issue. I ultimately went as far as having an AI compare the mod list of my crash log and the mod list of the crash log posted further above, identified the about 160 overlapping mods and removed them all - but the issue persisted.

I'm going to check if one of the server side only mods might be the cause by removing those in the evening, but beyond that it seems I'm out of luck. Thankfully we can use 1.9.1 for the meanwhile.

Try to narrow down both then? We don't need to have exact one half casuing the issue while the other not...And could you try with only UMC&IT&TrackAPI installed?
Really sorry for the inconvenience

[D3nnis3n]

Sorry, I think I haven't been clear - I just wanted to note that already on the first step no half showed no error (which is unusual and hints at it potentially being a multi-mod problem or not related at all to other mods). I did try to go deeper for two hours and broke it down to chunks of 15 mods but couldn't make out the respective mod, all combinations failed.

I'm going to give just the three mods you mentioned a try, but unfortunately I won't be able to do more mod juggling, I just don't have the time to test 300 mods each on their own (especially when there is the potential that multiple trigger it or it requires two mods at the same time) - we're just trying to play our 9 year old world once more and get some nostalgia out of it. In the process of updating the 5 years old pack I reported all issues I found to the respective mod authors that had updates available since then.

We can do with 1.9.1 (we had 1.8 on the original modpack), it's no problem. But I'm nontheless happy to test any builds.
Maybe someone else has the issue with less mods and could chime in at some point as well.