Tip, on uk.nukeduck.hud.util.MathUtil, before call to Random.next*, check if the number is negative, if is negative, multiply by -1.

STACKTRACE:

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

-- Head --
Thread: Client thread
Stacktrace:
at java.util.Random.nextInt(Unknown Source)
at tk.nukeduck.hud.util.MathUtil.randomRange(MathUtil.java:65)
at tk.nukeduck.hud.util.MathUtil.randomPoint(MathUtil.java:78)
at tk.nukeduck.hud.element.particles.ParticleBase.createRandom(ParticleBase.java:33)
at tk.nukeduck.hud.element.particles.BloodSplatters.onEntityDamage(BloodSplatters.java:37)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_344_BloodSplatters_onEntityDamage_LivingDamageEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.common.ForgeHooks.onLivingDamage(ForgeHooks.java:596)
at net.minecraft.entity.player.EntityPlayer.func_70665_d(EntityPlayer.java:1128)
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:919)
at net.minecraft.entity.player.EntityPlayer.func_70097_a(EntityPlayer.java:1038)
at net.minecraft.entity.player.EntityPlayerMP.func_70097_a(EntityPlayerMP.java:645)
at micdoodle8.mods.galacticraft.core.entities.player.GCEntityPlayerMP.func_70097_a(GCEntityPlayerMP.java:68)
at net.minecraft.entity.monster.EntityMob.func_70652_k(EntityMob.java:99)
at net.minecraft.entity.monster.EntityZombie.func_70652_k(EntityZombie.java:294)
at net.minecraft.entity.ai.EntityAIAttackMelee.func_190102_a(EntityAIAttackMelee.java:178)
at net.minecraft.entity.ai.EntityAIAttackMelee.func_75246_d(EntityAIAttackMelee.java:167)
at net.minecraft.entity.ai.EntityAIZombieAttack.func_75246_d(SourceFile:28)
at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:129)
at net.minecraft.entity.EntityLiving.func_70626_be(EntityLiving.java:888)
at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2352)
at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:678)
at net.minecraft.entity.monster.EntityMob.func_70636_d(EntityMob.java:45)
at net.minecraft.entity.monster.EntityZombie.func_70636_d(EntityZombie.java:223)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2172)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:377)
at net.minecraft.entity.monster.EntityMob.func_70071_h_(EntityMob.java:50)
at net.minecraft.world.World.func_72866_a(World.java:1993)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
at net.minecraft.world.World.func_72870_g(World.java:1955)

-- Entity being ticked --
Details:
Entity Type: minecraft:zombie (net.minecraft.entity.monster.EntityZombie)
Entity ID: 321986
Entity Name: Zumbi
Entity's Exact location: -222.58, 222.00, 298.50
Entity's Block location: World: (-223,222,298), Chunk: (at 1,13,10 in -14,18; contains blocks -224,0,288 to -209,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.01, -0.08, -0.06
Entity's Passengers: []
Entity's Vehicle: ERROR NullPointerException: null
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1759)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:613)

-- Affected level --
Details:
Level name: Mundo pra jogar com a Lindanessa
All players: 2 total; [GCEntityPlayerMP['Leterio'/307, l='Mundo pra jogar com a Lindanessa', x=-222.87, y=222.00, z=297.23], GCEntityPlayerMP['Vanessa'/11165, l='Mundo pra jogar com a Lindanessa', x=-251.58, y=227.00, z=245.95]]
Chunk stats: ServerChunkCache: 767 Drop: 0
Level seed: 6676492010719413537
Level generator: ID 04 - customized, ver 0. Features enabled: true
Level generator options: {"coordinateScale":684.0,"heightScale":684.0,"lowerLimitScale":64.0,"upperLimitScale":2.0,"depthNoiseScaleX":200.0,"depthNoiseScaleZ":200.0,"depthNoiseScaleExponent":0.5,"mainNoiseScaleX":80.0,"mainNoiseScaleY":160.0,"mainNoiseScaleZ":80.0,"baseSize":8.5,"stretchY":12.0,"biomeDepthWeight":1.0,"biomeDepthOffset":0.0,"biomeScaleWeight":1.0,"biomeScaleOffset":1.0,"seaLevel":63,"useCaves":true,"useDungeons":true,"dungeonChance":8,"useStrongholds":true,"useVillages":true,"useMineShafts":true,"useTemples":true,"useMonuments":true,"useMansions":true,"useRavines":true,"useWaterLakes":true,"waterLakeChance":4,"useLavaLakes":true,"lavaLakeChance":80,"useLavaOceans":false,"fixedBiome":-1,"biomeSize":4,"riverSize":4,"dirtSize":33,"dirtCount":10,"dirtMinHeight":0,"dirtMaxHeight":255,"gravelSize":33,"gravelCount":8,"gravelMinHeight":0,"gravelMaxHeight":255,"graniteSize":33,"graniteCount":10,"graniteMinHeight":0,"graniteMaxHeight":192,"dioriteSize":33,"dioriteCount":10,"dioriteMinHeight":0,"dioriteMaxHeight":192,"andesiteSize":33,"andesiteCount":10,"andesiteMinHeight":0,"andesiteMaxHeight":192,"coalSize":17,"coalCount":20,"coalMinHeight":0,"coalMaxHeight":192,"ironSize":9,"ironCount":20,"ironMinHeight":0,"ironMaxHeight":128,"goldSize":9,"goldCount":2,"goldMinHeight":0,"goldMaxHeight":64,"redstoneSize":8,"redstoneCount":8,"redstoneMinHeight":0,"redstoneMaxHeight":48,"diamondSize":8,"diamondCount":1,"diamondMinHeight":0,"diamondMaxHeight":32,"lapisSize":7,"lapisCount":1,"lapisCenterHeight":24,"lapisSpread":24}
Level spawn location: World: (-212,64,240), Chunk: (at 12,4,0 in -14,15; contains blocks -224,0,240 to -209,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 1187222 game time, 1227659 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 103162 (now: false), thunder time: 114347 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:767)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:252)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_191, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 417063960 bytes (397 MB) / 2360496128 bytes (2251 MB) up to 4281597952 bytes (4083 MB)
JVM Flags: 3 total; -Xmn128M -Xmx4096M -XX:+UseConcMarkSweepGC
IntCache: cache: 0, tcache: 0, allocated: 15, tallocated: 95
FML: MCP 9.42 Powered by Forge 14.23.5.2768 Optifine OptiFine_1.12.2_HD_U_E1 52 mods loaded, 52 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

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-1.12.2-14.23.5.2768.jar	e3c3d50c7c986df74c645c0ac54639741c90a557
UCHIJAAAA	forge	14.23.5.2768	forge-1.12.2-14.23.5.2768.jar	e3c3d50c7c986df74c645c0ac54639741c90a557
UCHIJAAAA	micdoodlecore		minecraft.jar	None
UCHIJAAAA	buildcraftlib	7.99.19	buildcraft-7.99.19.jar	None
UCHIJAAAA	buildcraftcore	7.99.19	buildcraft-7.99.19.jar	None
UCHIJAAAA	buildcraftfactory	7.99.19	buildcraft-7.99.19.jar	None
UCHIJAAAA	buildcrafttransport	7.99.19	buildcraft-7.99.19.jar	None
UCHIJAAAA	buildcraftsilicon	7.99.19	buildcraft-7.99.19.jar	None
UCHIJAAAA	additionalpipes	6.0.0.8	additionalpipes-6.0.0.8.jar	None
UCHIJAAAA	hud	1.4-beta	Better-HUD-Mod-1.12.2.jar	None
UCHIJAAAA	bookshelf	2.3.568	Bookshelf-1.12.2-2.3.568.jar	d476d1b22b218a10d845928d1665d45fce301b27
UCHIJAAAA	buildcraftbuilders	7.99.19	buildcraft-7.99.19.jar	None
UCHIJAAAA	buildcraftenergy	7.99.19	buildcraft-7.99.19.jar	None
UCHIJAAAA	buildcraftrobotics	7.99.19	buildcraft-7.99.19.jar	None
UCHIJAAAA	ic2	2.8.102-ex112	industrialcraft-2-2.8.102-ex112.jar	None
UCHIJAAAA	jei	4.13.1.222	jei_1.12.2-4.13.1.222.jar	None
UCHIJAAAA	forestry	5.8.2.372	forestry_1.12.2-5.8.2.372.jar	None
UCHIJAAAA	buildcraftcompat	7.99.15	buildcraft-compat-7.99.15.jar	None
UCHIJAAAA	codechickenlib	3.2.2.353	CodeChickenLib-1.12.2-3.2.2.353-universal.jar	f1850c39b2516232a2108a7bd84d1cb5df93b261
UCHIJAAAA	chickenchunks	2.4.1.73	ChickenChunks-Mod-1.12.2.jar	f1850c39b2516232a2108a7bd84d1cb5df93b261
UCHIJAAAA	cxlibrary	1.6.1	cxlibrary-1.12.1-1.6.1.jar	None
UCHIJAAAA	eplus	5.0.163	Enchanting-Plus-Mod-1.12.2.jar	d476d1b22b218a10d845928d1665d45fce301b27
UCHIJAAAA	gottschcore	1.5.1	GottschCore-mc1.12.2-f14.23.5.2768-v1.5.1.jar	None
UCHIJAAAA	fastladder	1.1.1	FastLadder-mc1.12.2-f14.23.5.2768-v1.1.1.jar	None
UCHIJAAAA	forgemultipartcbe	2.6.0.79	ForgeMultipart-1.12.2-2.6.0.79-universal.jar	f1850c39b2516232a2108a7bd84d1cb5df93b261
UCHIJAAAA	microblockcbe	2.6.0.79	ForgeMultipart-1.12.2-2.6.0.79-universal.jar	None
UCHIJAAAA	minecraftmultipartcbe	2.6.0.79	ForgeMultipart-1.12.2-2.6.0.79-universal.jar	None
UCHIJAAAA	galacticraftcore	4.0.1.181	GalacticraftCore-1.12.2-4.0.1.181.jar	None
UCHIJAAAA	ichunutil	7.1.4	iChun-Util-Mod-1.12.2.jar	None
UCHIJAAAA	inventorytweaks	1.63+release.109.220f184	InventoryTweaks-1.63.jar	55d2cd4f5f0961410bf7b91ef6c6bf00a766dcbe
UCHIJAAAA	metalchests	v3.9.0.g9b0c79e	MetalChests-v3.9.0.g9b0c79e.jar	None
UCHIJAAAA	morefurnaces	1.10.1	More-Furnaces-Mod-1.12.1.jar	None
UCHIJAAAA	mrtjpcore	2.1.3.35	MrTJPCore-1.12.2-2.1.3.35-universal.jar	None
UCHIJAAAA	nei	2.4.2	NotEnoughItems-1.12.2-2.4.2.240-universal.jar	f1850c39b2516232a2108a7bd84d1cb5df93b261
UCHIJAAAA	portalgun	7.0.2	Portal-Gun-Mod-1.12.2.jar	None
UCHIJAAAA	projectred-core	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-Base.jar	None
UCHIJAAAA	projectred-compat	1.0	ProjectRed-1.12.2-4.9.1.92-compat.jar	None
UCHIJAAAA	projectred-integration	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-integration.jar	None
UCHIJAAAA	projectred-transmission	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-integration.jar	None
UCHIJAAAA	projectred-fabrication	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-fabrication.jar	None
UCHIJAAAA	projectred-illumination	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-lighting.jar	None
UCHIJAAAA	projectred-expansion	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-mechanical.jar	None
UCHIJAAAA	projectred-relocation	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-mechanical.jar	None
UCHIJAAAA	projectred-transportation	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-mechanical.jar	None
UCHIJAAAA	projectred-exploration	4.9.1.92	ProjectRed-1.12.2-4.9.1.92-world.jar	None
UCHIJAAAA	spawnercraft	4.0.0	SpawnerCraft 1.12.2-4.0.0.jar	None
UCHIJAAAA	bspkrscore	at_0.9	TreeCapitator-Mod-1.12.jar	None
UCHIJAAAA	treecapitator	at_0.9	TreeCapitator-Mod-1.12.jar	None
UCHIJAAAA	twilightforest	3.8.689	twilightforest-1.12.2-3.8.689-universal.jar	None
UCHIJAAAA	xaerominimap	1.15.8	Xaeros-Minimap-Mod-1.12.jar	None

Loaded coremods (and transformers):
Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
invtweaks.forge.asm.ContainerTransformer
MicdoodlePlugin (MicdoodleCore-1.12.2-4.0.1.181.jar)
micdoodle8.mods.miccore.MicdoodleTransformer
CXLibraryCore (cxlibrary-1.12.1-1.6.1.jar)
cubex2.cxlibrary.CoreModTransformer
GL info: ERROR RuntimeException: No OpenGL context found in the current thread.
forestry : Modules have been disabled in the config: Book, Mail, Backpack
Profiler Position: N/A (disabled)
Player Count: 2 / 8; [GCEntityPlayerMP['Leterio'/307, l='Mundo pra jogar com a Lindanessa', x=-222.87, y=222.00, z=297.23], GCEntityPlayerMP['Vanessa'/11165, l='Mundo pra jogar com a Lindanessa', x=-251.58, y=227.00, z=245.95]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
OptiFine Version: OptiFine_1.12.2_HD_U_E1
OptiFine Build: 20180628-111228
Render Distance Chunks: 12
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 4.5.13492 Compatibility Profile Context 22.19.677.257
OpenGlRenderer: Radeon(TM) RX 460 Graphics
OpenGlVendor: ATI Technologies Inc.
CpuCount: 4
[00:42:49] [Server thread/INFO] [minecraft/MinecraftServer]: Saving worlds
[00:42:50] [Server thread/INFO] [minecraft/MinecraftServer]: Saving chunks for level 'Mundo pra jogar com a Lindanessa'/overworld
[00:42:50] [main/INFO] [STDOUT]: [net.minecraft.init.Bootstrap:func_179870_a:553]: #@!@# Game crashed! Crash report saved to: #@!@# D:\Jogos\Minecraft\Client.minecraft\crash-reports\crash-2018-12-16_00.42.48-server.txt
[00:42:50] [main/INFO] [FML]: Waiting for the server to terminate/save.
[00:42:51] [Server thread/INFO] [FML]: Unloading dimension 0
[00:42:52] [Server thread/INFO] [FML]: Applying holder lookups
[00:42:52] [Server thread/INFO] [FML]: Holder lookups applied
[00:42:52] [Server thread/INFO] [Galacticraft]: Unregistered Dimension: -28
[00:42:52] [Server thread/INFO] [FML]: The state engine was in incorrect state SERVER_STOPPING and forced into state SERVER_STOPPED. Errors may have been discarded.
[00:42:52] [main/INFO] [FML]: Server terminated.
[00:42:52] [Client Shutdown Thread/INFO] [minecraft/MinecraftServer]: Stopping server
Exception in thread "Client Shutdown Thread" AL lib: (EE) alc_cleanup: 1 device not closed

This issue has been fixed already.