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    • I think you have to also set the ATTACK_DAMAGE attribute in your registerAttributes() method.
    • Use the debugger to figure out what is null on that line.
    • The order is intentionally not specified. Do not rely on the registry order. If you need to reference other registry entries, use RegistryObject.
    • HTTP is correctly redirected to HTTPS in my tests.
    • This is my code: package com.demrux.cursedminecraft.entities; import com.demrux.cursedminecraft.util.RegistryHandler; import com.mojang.blaze3d.platform.GlStateManager; import net.minecraft.entity.AgeableEntity; import net.minecraft.entity.CreatureEntity; import net.minecraft.entity.ai.goal.BreedGoal; import net.minecraft.entity.ai.goal.FollowMobGoal; import net.minecraft.entity.ai.goal.FollowParentGoal; import net.minecraft.entity.ai.goal.LookAtGoal; import net.minecraft.entity.ai.goal.LookRandomlyGoal; import net.minecraft.entity.ai.goal.MeleeAttackGoal; import net.minecraft.entity.ai.brain.task.WalkToTargetTask; import net.minecraft.entity.ai.goal.NearestAttackableTargetGoal; import net.minecraft.entity.ai.goal.WaterAvoidingRandomWalkingGoal; import net.minecraft.entity.effect.LightningBoltEntity; import net.minecraft.entity.passive.AnimalEntity; import net.minecraft.entity.player.PlayerEntity; import net.minecraft.nbt.CompoundNBT; import net.minecraft.util.math.BlockPos; import net.minecraft.entity.EntityType; import net.minecraft.entity.ILivingEntityData; import net.minecraft.entity.SharedMonsterAttributes; import net.minecraft.entity.SpawnReason; import net.minecraft.world.World; public class TremEntity extends AnimalEntity{ public TremEntity(EntityType<? extends AnimalEntity> type, World worldIn) { super(type, worldIn); } @Override public AgeableEntity createChild(AgeableEntity ageable) { TremEntity entity = new TremEntity(RegistryHandler.TREM_ENTITY.get(), this.world); entity.onInitialSpawn(this.world, this.world.getDifficultyForLocation(new BlockPos(entity)), SpawnReason.BREEDING, (ILivingEntityData) null, (CompoundNBT) null); entity.setGlowing(true); return entity; } protected void registerGoals() { super.registerGoals(); this.goalSelector.addGoal(2, new BreedGoal(this, 1.0D)); this.goalSelector.addGoal(4, new WaterAvoidingRandomWalkingGoal(this, 1.0D)); this.goalSelector.addGoal(5, new LookAtGoal(this, PlayerEntity.class, 6.0F)); this.goalSelector.addGoal(6, new LookRandomlyGoal(this)); this.goalSelector.addGoal(0, new NearestAttackableTargetGoal(this, PlayerEntity.class, true)); this.goalSelector.addGoal(1, new MeleeAttackGoal(this, 1.0D, false)); } @Override protected void updateAITasks() { super.updateAITasks(); } @Override public void livingTick() { super.livingTick(); } @Override public void registerAttributes() { super.registerAttributes(); this.getAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(16.0D); this.getAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0.40D); } @Override public void onStruckByLightning(LightningBoltEntity lightningBolt) { this.setGlowing(true); } } This is my crash log: Time: 7/8/20, 2:54 PM Description: Ticking entity java.lang.NullPointerException: Ticking entity at net.minecraft.entity.MobEntity.attackEntityAsMob(MobEntity.java:1279) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.entity.ai.goal.MeleeAttackGoal.checkAndPerformAttack(MeleeAttackGoal.java:154) ~[?:?] {re:classloading} at net.minecraft.entity.ai.goal.MeleeAttackGoal.tick(MeleeAttackGoal.java:146) ~[?:?] {re:classloading} at net.minecraft.entity.ai.goal.PrioritizedGoal.tick(PrioritizedGoal.java:63) ~[?:?] {re:classloading} at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:?] {} at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[?:?] {} at java.util.Iterator.forEachRemaining(Iterator.java:133) ~[?:?] {} at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:?] {} at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[?:?] {} at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[?:?] {} at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?] {} at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?] {} at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?] {} at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) ~[?:?] {} at net.minecraft.entity.ai.goal.GoalSelector.tick(GoalSelector.java:89) ~[?:?] {re:classloading} at net.minecraft.entity.MobEntity.updateEntityActionState(MobEntity.java:652) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.entity.LivingEntity.livingTick(LivingEntity.java:2426) ~[?:?] {re:classloading} at net.minecraft.entity.MobEntity.livingTick(MobEntity.java:512) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.entity.AgeableEntity.livingTick(AgeableEntity.java:169) ~[?:?] {re:classloading} at net.minecraft.entity.passive.AnimalEntity.livingTick(AnimalEntity.java:46) ~[?:?] {re:classloading} at com.demrux.cursedminecraft.entities.TremEntity.livingTick(TremEntity.java:64) ~[?:?] {re:classloading} at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2264) ~[?:?] {re:classloading} at net.minecraft.entity.MobEntity.tick(MobEntity.java:311) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.world.server.ServerWorld.updateEntity(ServerWorld.java:615) ~[?:?] {re:classloading} at net.minecraft.world.World.guardEntityTick(World.java:586) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.world.server.ServerWorld.tick(ServerWorld.java:404) ~[?:?] {re:classloading} at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:886) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:821) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662) ~[?:?] {re:classloading,pl:accesstransformer:B} at java.lang.Thread.run(Thread.java:834) ~[?:?] {} A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Render thread Stacktrace: at net.minecraft.entity.MobEntity.attackEntityAsMob(MobEntity.java:1279) at net.minecraft.entity.ai.goal.MeleeAttackGoal.checkAndPerformAttack(MeleeAttackGoal.java:154) at net.minecraft.entity.ai.goal.MeleeAttackGoal.tick(MeleeAttackGoal.java:146) at net.minecraft.entity.ai.goal.PrioritizedGoal.tick(PrioritizedGoal.java:63) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133) at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) at net.minecraft.entity.ai.goal.GoalSelector.tick(GoalSelector.java:89) at net.minecraft.entity.MobEntity.updateEntityActionState(MobEntity.java:652) at net.minecraft.entity.LivingEntity.livingTick(LivingEntity.java:2426) at net.minecraft.entity.MobEntity.livingTick(MobEntity.java:512) at net.minecraft.entity.AgeableEntity.livingTick(AgeableEntity.java:169) at net.minecraft.entity.passive.AnimalEntity.livingTick(AnimalEntity.java:46) at com.demrux.cursedminecraft.entities.TremEntity.livingTick(TremEntity.java:64) at net.minecraft.entity.LivingEntity.tick(LivingEntity.java:2264) at net.minecraft.entity.MobEntity.tick(MobEntity.java:311) at net.minecraft.world.server.ServerWorld.updateEntity(ServerWorld.java:615) -- Entity being ticked -- Details: Entity Type: cm:trem_entity (com.demrux.cursedminecraft.entities.TremEntity) Entity ID: 18 Entity Name: TREM Entity's Exact location: 261.59, 68.00, 155.10 Entity's Block location: World: (261,68,155), Chunk: (at 5,4,11 in 16,9; contains blocks 256,0,144 to 271,255,159), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511) Entity's Momentum: -0.07, -0.08, -0.17 Entity's Passengers: [] Entity's Vehicle: ~~ERROR~~ NullPointerException: null Stacktrace: at net.minecraft.world.World.guardEntityTick(World.java:586) at net.minecraft.world.server.ServerWorld.tick(ServerWorld.java:404) -- Affected level -- Details: All players: 1 total; [ServerPlayerEntity['Dev'/236, l='Mert'in Dünyas?', x=261.73, y=68.00, z=154.34]] Chunk stats: ServerChunkCache: 2301 Level dimension: DimensionType{minecraft:overworld} Level name: Mert'in Dünyas? Level seed: 6708017606537800173 Level generator: ID 00 - default, ver 1. Features enabled: true Level generator options: {} Level spawn location: World: (240,69,170), Chunk: (at 0,4,10 in 15,10; contains blocks 240,0,160 to 255,255,175), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511) Level time: 96838 game time, 1000 day time Known server brands: forge Level was modded: true Level storage version: 0x04ABD - Anvil Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false) Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true Stacktrace: at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:886) at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:821) at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662) at java.base/java.lang.Thread.run(Thread.java:834) -- System Details -- Details: Minecraft Version: 1.15.2 Minecraft Version ID: 1.15.2 Operating System: Windows 10 (amd64) version 10.0 Java Version: 11.0.7, AdoptOpenJDK Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), AdoptOpenJDK Memory: 268566528 bytes (256 MB) / 1196425216 bytes (1141 MB) up to 4276092928 bytes (4078 MB) CPUs: 12 JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump ModLauncher: 5.1.0+69+master.79f13f7 ModLauncher launch target: fmluserdevclient ModLauncher naming: mcp ModLauncher services: /eventbus-2.2.0-service.jar eventbus PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar object_holder_definalize PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar runtime_enum_extender PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar capability_inject_definalize PLUGINSERVICE /accesstransformers-2.1.1-shadowed.jar accesstransformer PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar runtimedistcleaner PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar fml TRANSFORMATIONSERVICE FML: 31.2 Forge: net.minecraftforge:31.2.0 FML Language Providers: javafml@31.2 minecraft@1 Mod List: client-extra.jar Minecraft {minecraft@1.15.2 DONE} forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-recomp.jar Forge {forge@31.2.0 DONE} main Cursed Minecraft {cm@1.15.2-1.0.0 DONE} Player Count: 1 / 8; [ServerPlayerEntity['Dev'/236, l='Mert'in Dünyas?', x=261.73, y=68.00, z=154.34]] Data Packs: vanilla, mod:forge (incompatible), mod:cm Type: Integrated Server (map_client.txt) Is Modded: Definitely; Client brand changed to 'forge'   My game crashes while the Custom Mob hits the Player Entity. I currently don't know what causes this error.  
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