With some friends we made a small server modded with a home made modpack and if it works without worries for most of us, a friend installed near a river crashes regularly while the others have no problem. The crash report is the following (thanking all the good people who will help me to fix the problem of this friend)

 

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 3/20/23, 9:20 PM
Description: Tesselating liquid in world

java.lang.NullPointerException: Cannot invoke "net.minecraft.core.Holder.m_203334_()" because the return value of "net.minecraft.client.multiplayer.ClientLevel.m_204166_(net.minecraft.core.BlockPos)" is null
    at net.minecraft.client.multiplayer.ClientLevel.m_104762_(ClientLevel.java:714) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:ClientLevelMixin,pl:mixin:APP:canary.mixins.json:chunk.entity_class_groups.ClientLevelMixin,pl:mixin:APP:byg.mixins.json:access.client.ClientLevelAccess,pl:mixin:APP:architectury.mixins.json:MixinClientLevel,pl:mixin:APP:blueprint.mixins.json:client.ClientLevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.multiplayer.ClientLevel.m_194167_(ClientLevel.java:113) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:ClientLevelMixin,pl:mixin:APP:canary.mixins.json:chunk.entity_class_groups.ClientLevelMixin,pl:mixin:APP:byg.mixins.json:access.client.ClientLevelAccess,pl:mixin:APP:architectury.mixins.json:MixinClientLevel,pl:mixin:APP:blueprint.mixins.json:client.ClientLevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.color.block.BlockTintCache.m_193812_(BlockTintCache.java:91) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading}
    at net.minecraft.client.multiplayer.ClientLevel.m_6171_(ClientLevel.java:697) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:ClientLevelMixin,pl:mixin:APP:canary.mixins.json:chunk.entity_class_groups.ClientLevelMixin,pl:mixin:APP:byg.mixins.json:access.client.ClientLevelAccess,pl:mixin:APP:architectury.mixins.json:MixinClientLevel,pl:mixin:APP:blueprint.mixins.json:client.ClientLevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.chunk.RenderChunkRegion.m_6171_(RenderChunkRegion.java:67) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading}
    at net.minecraft.client.renderer.BiomeColors.m_108796_(BiomeColors.java:14) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading,pl:accesstransformer:B,xf:fml:twilightforest:dragons}
    at net.minecraft.client.renderer.BiomeColors.m_108811_(BiomeColors.java:26) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading,pl:accesstransformer:B,xf:fml:twilightforest:dragons}
    at net.minecraftforge.fluids.FluidAttributes$Water.getColor(FluidAttributes.java:440) ~[forge-1.18.2-40.1.85-universal.jar%23323!/:?] {re:classloading}
    at net.minecraft.client.renderer.block.LiquidBlockRenderer.m_203173_(LiquidBlockRenderer.java:72) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.block.BlockRenderDispatcher.m_203143_(BlockRenderDispatcher.java:78) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
    at codechicken.lib.render.block.CCBlockRendererDispatcher.m_203143_(CCBlockRendererDispatcher.java:98) ~[CodeChickenLib-1.18.2-4.1.3.480-universal.jar%23110!/:4.1.3.480] {re:classloading}
    at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher$RenderChunk$RebuildTask.m_112865_(ChunkRenderDispatcher.java:625) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:flywheel.mixins.json:instancemanage.ChunkRebuildHooksMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher$RenderChunk$RebuildTask.m_5869_(ChunkRenderDispatcher.java:557) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:flywheel.mixins.json:instancemanage.ChunkRebuildHooksMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher.m_194412_(ChunkRenderDispatcher.java:122) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading,pl:runtimedistcleaner:A}
    at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] {}
    at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) ~[?:?] {}
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
    at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
    at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {re:computing_frames}
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {re:computing_frames}
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {}

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Render thread
Stacktrace:
    at net.minecraft.client.multiplayer.ClientLevel.m_104762_(ClientLevel.java:714) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:ClientLevelMixin,pl:mixin:APP:canary.mixins.json:chunk.entity_class_groups.ClientLevelMixin,pl:mixin:APP:byg.mixins.json:access.client.ClientLevelAccess,pl:mixin:APP:architectury.mixins.json:MixinClientLevel,pl:mixin:APP:blueprint.mixins.json:client.ClientLevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.multiplayer.ClientLevel.m_194167_(ClientLevel.java:113) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:ClientLevelMixin,pl:mixin:APP:canary.mixins.json:chunk.entity_class_groups.ClientLevelMixin,pl:mixin:APP:byg.mixins.json:access.client.ClientLevelAccess,pl:mixin:APP:architectury.mixins.json:MixinClientLevel,pl:mixin:APP:blueprint.mixins.json:client.ClientLevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.color.block.BlockTintCache.m_193812_(BlockTintCache.java:91) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading}
-- Block being tesselated --
Details:
    Block location: World: (2871,53,59), Section: (at 7,5,11 in 179,3,3; chunk contains blocks 2864,-64,48 to 2879,319,63), Region: (5,0; contains chunks 160,0 to 191,31, blocks 2560,-64,0 to 3071,319,511)
Stacktrace:
    at net.minecraft.client.renderer.block.BlockRenderDispatcher.m_203143_(BlockRenderDispatcher.java:78) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
    at codechicken.lib.render.block.CCBlockRendererDispatcher.m_203143_(CCBlockRendererDispatcher.java:98) ~[CodeChickenLib-1.18.2-4.1.3.480-universal.jar%23110!/:4.1.3.480] {re:classloading}
    at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher$RenderChunk$RebuildTask.m_112865_(ChunkRenderDispatcher.java:625) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:flywheel.mixins.json:instancemanage.ChunkRebuildHooksMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher$RenderChunk$RebuildTask.m_5869_(ChunkRenderDispatcher.java:557) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:flywheel.mixins.json:instancemanage.ChunkRebuildHooksMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher.m_194412_(ChunkRenderDispatcher.java:122) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading,pl:runtimedistcleaner:A}
    at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] {}
    at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) ~[?:?] {}
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
    at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
    at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {re:computing_frames}
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {re:computing_frames}
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {}

-- Affected level --
Details:
    All players: 2 total; [LocalPlayer['Amarcanthe'/967483, l='ClientLevel', x=3006.30, y=103.15, z=39.10], RemotePlayer['MamanLiline'/979183, l='ClientLevel', x=2932.87, y=73.00, z=57.32]]
    Chunk stats: 5041, 719
    Level dimension: minecraft:overworld
    Level spawn location: World: (-208,83,-32), Section: (at 0,3,0 in -13,5,-2; chunk contains blocks -208,-64,-32 to -193,319,-17), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,-64,-512 to -1,319,-1)
    Level time: 10481453 game time, 10677277 day time
    Server brand: forge
    Server type: Non-integrated multiplayer server
Stacktrace:
    at net.minecraft.client.multiplayer.ClientLevel.m_6026_(ClientLevel.java:407) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.mixins.json:ClientLevelMixin,pl:mixin:APP:canary.mixins.json:chunk.entity_class_groups.ClientLevelMixin,pl:mixin:APP:byg.mixins.json:access.client.ClientLevelAccess,pl:mixin:APP:architectury.mixins.json:MixinClientLevel,pl:mixin:APP:blueprint.mixins.json:client.ClientLevelMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.m_91354_(Minecraft.java:2262) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:MinecraftMixin,pl:mixin:APP:mixin.cleancut.json:MinecraftMixin,pl:mixin:APP:ars_nouveau.mixins.json:light.ClientMixin,pl:mixin:APP:flywheel.mixins.json:PausedPartialTickAccessor,pl:mixin:APP:byg_forge.mixins.json:client.MixinMinecraft,pl:mixin:APP:bookshelf.common.mixins.json:client.AccessorMinecraft,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:blueprint.mixins.json:client.MinecraftMixin,pl:mixin:APP:mixin.dynamic_asset_generator.json:MinecraftMixin,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:APP:ars_nouveau.mixins.json:camera.MinecraftMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher.m_199948_(ChunkRenderDispatcher.java:129) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:655) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:MinecraftMixin,pl:mixin:APP:mixin.cleancut.json:MinecraftMixin,pl:mixin:APP:ars_nouveau.mixins.json:light.ClientMixin,pl:mixin:APP:flywheel.mixins.json:PausedPartialTickAccessor,pl:mixin:APP:byg_forge.mixins.json:client.MixinMinecraft,pl:mixin:APP:bookshelf.common.mixins.json:client.AccessorMinecraft,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:blueprint.mixins.json:client.MinecraftMixin,pl:mixin:APP:mixin.dynamic_asset_generator.json:MinecraftMixin,pl:mixin:APP:create.mixins.json:WindowResizeMixin,pl:mixin:APP:ars_nouveau.mixins.json:camera.MinecraftMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(Main.java:205) ~[client-1.18.2-20220404.173914-srg.jar%23318!/:?] {re:classloading,re:mixin,pl:runtimedistcleaner:A,pl:mixin:A,pl:runtimedistcleaner:A}
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
    at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
    at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$launchService$0(CommonClientLaunchHandler.java:31) ~[fmlloader-1.18.2-40.1.85.jar%2317!/:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.1.3.jar%235!/:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.1.3.jar%235!/:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.1.3.jar%235!/:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.1.3.jar%235!/:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.1.3.jar%235!/:?] {}
    at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.1.3.jar%235!/:?] {}
    at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.1.3.jar%235!/:?] {}
    at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149) [bootstraplauncher-1.0.0.jar:?] {}

It's likely that they are missing a mod from the server since it seems to crash when trying to get a nonexistent block.

Can't be that, we all have exactly the same modpack and he is the only crashing, that would be strange

12 hours ago, Schmetterbar said:

Can't be that, we all have exactly the same modpack and he is the only crashing, that would be strange

I would ask you to confirm that just to make sure.

On 3/22/2023 at 10:02 AM, Schmetterbar said:

    at codechicken.lib.render.block.CCBlockRendererDispatcher.m_203143_(CCBlockRendererDispatcher.java:98) ~[CodeChickenLib-1.18.2-4.1.3.480-universal.jar%23110!/:4.1.3.480] {re:classloading}

It seems to be some sort of rendering of a block as the most likely culprit. So, you should verify that you can render the block with an issue and only your friend can't. It's most likely either a difference in the mods used or a difference in the Forge version, though the latter is less likely since the mods mention what versions they support.

Quote

It seems to be some sort of rendering of a block as the most likely culprit.

It's likely only your friend can see the block in question. Try teleporting to your friend's location and see if you crash.

The problem block appears to be at:

Quote

Block location: World: (2871,53,59)

It's a water block and yep, I can render it, it's a mere water block that i filed with some stone and yet, he is still crashing. He can play some time (20 to 40 minute) but after that, boom, he got a crash

If it doesn't crash for you, but does for them, then there is clearly something wrong with their installation.

The error message is uninformative, it just says "NullPointerException" so we can tell what is causing the issue from that.

 

Get them to do a full reinstall of forge and the modpack from scratch. So you know for sure they are using what you think they should be using.

 

Also tell them not to install any additional/optional client side mods like optifine. Those are always the first candidates for strange bugs.