Crashes when a Mushroom Biome loads with global spawnweight set to 0

[Ghostrider231]

This isn't much to say, but something worth pointing out because in the config, it says [range 0 ~ 10000].

Apparently the crash can be repeated by just simply entering/teleporting to any mushroom biome so as long i have the global spawnweight set to 0. (Doesn't matter if the world is new or existing)

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Config Example

NO Crashes in the Mushroom biome

# Spawn weigth of Techguns NPCs in the Nether, determines how many TG npcs spawn [range: 0 ~ 10000, default: 300]
I:"Techguns Spawnweight NEther"=1

# Spawn weigth of Techguns NPCs, determines how many TG npcs spawn [range: 0 ~ 10000, default: 600]
I:"Techguns Spawnweight Overworld"=1

================

Crashes in the Mushroom biome

# Spawn weigth of Techguns NPCs in the Nether, determines how many TG npcs spawn [range: 0 ~ 10000, default: 300]
I:"Techguns Spawnweight NEther"=0

# Spawn weigth of Techguns NPCs, determines how many TG npcs spawn [range: 0 ~ 10000, default: 600]
I:"Techguns Spawnweight Overworld"=0

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The Crash Report (Been cut down to the important parts)

---- Minecraft Crash Report ----

WARNING: coremods are present:
Techguns Core (techguns-1.12.2-2.0.1.1.jar)
Contact their authors BEFORE contacting forge

// Don't do that.

Time: 2/2/18 12:40 PM
Description: Exception ticking world

java.lang.IllegalArgumentException
at net.minecraft.util.WeightedRandom.func_76273_a(SourceFile:18)
at net.minecraft.util.WeightedRandom.func_76271_a(SourceFile:37)
at net.minecraft.world.WorldServer.func_175734_a(WorldServer.java:246)
at net.minecraft.world.WorldEntitySpawner.func_77192_a(WorldEntitySpawner.java:127)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:203)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:754)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
at java.lang.Thread.run(Thread.java:745)

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

-- Head --
Thread: Server thread
Stacktrace:
at net.minecraft.util.WeightedRandom.func_76273_a(SourceFile:18)
at net.minecraft.util.WeightedRandom.func_76271_a(SourceFile:37)
at net.minecraft.world.WorldServer.func_175734_a(WorldServer.java:246)
at net.minecraft.world.WorldEntitySpawner.func_77192_a(WorldEntitySpawner.java:127)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:203)

Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:754)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
at java.lang.Thread.run(Thread.java:745)

| State     | ID                | Version      | Source                        | Signature                                |
|:--------- |:----------------- |:------------ |:----------------------------- |:---------------------------------------- |
| UCHIJAAAA | minecraft         | 1.12.2       | minecraft.jar                 | None                                     |
| UCHIJAAAA | mcp               | 9.42         | minecraft.jar                 | None                                     |
| UCHIJAAAA | FML               | 8.0.99.99    | forge-1.12.2-14.23.1.2607.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAA | forge             | 14.23.1.2607 | forge-1.12.2-14.23.1.2607.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAA | techguns_core     | 1.12.2-1.0   | minecraft.jar                 | None                                     |
| UCHIJAAAA | mercurius_updater | 1.0          | MercuriusUpdater-1.12.2.jar   | None                                     |
| UCHIJAAAA | techguns          | 2.0.1.1      | techguns-1.12.2-2.0.1.1.jar   | None                                     |

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Loaded coremods (and transformers): 

Techguns Core (techguns-1.12.2-2.0.1.1.jar)
techguns.core.TechgunsASMTransformer
GL info: ERROR RuntimeException: No OpenGL context found in the current thread.

[pWn3d1337]

Seems like the random gets 0 as upper bound in this case and crashed then. I have to look into this.

[momocow]

Any progress of this problem?

I also met with this which caused my server crashed while I and my friends were in the Twilight forest.

[philipjholm]

I also wonder if there is any progress on this?

[pWn3d1337]

No, this issue was posted in the 1.7 issue tracker which is dead.

I made a new issue in the 1.12 tracker and referenced it.