---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 2/13/21 8:32 PM
Description: Ticking entity

java.util.ConcurrentModificationException: null
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901) ~[?:1.8.0_51] {}
at java.util.ArrayList$Itr.next(ArrayList.java:851) ~[?:1.8.0_51] {}
at net.minecraft.entity.Entity.func_205012_q(Entity.java:1016) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:quark.mixins.json:EntityMixin,pl:mixin:APP:imm_ptl_mixins.json:common.collision.MixinEntity,pl:mixin:APP:imm_ptl_mixins.json:client.MixinEntity_C,pl:mixin:A}
at net.minecraft.entity.Entity.func_70030_z(Entity.java:409) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:quark.mixins.json:EntityMixin,pl:mixin:APP:imm_ptl_mixins.json:common.collision.MixinEntity,pl:mixin:APP:imm_ptl_mixins.json:client.MixinEntity_C,pl:mixin:A}
at net.minecraft.entity.LivingEntity.func_70030_z(LivingEntity.java:295) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:imm_ptl_mixins.json:common.MixinLivingEntity,pl:mixin:APP:imm_ptl_mixins.json:common.collision.MixinLivingEntity_C,pl:mixin:APP:imm_ptl_mixins.json:client.MixinLivingEntity_C,pl:mixin:A}
at net.minecraft.entity.MobEntity.func_70030_z(MobEntity.java:233) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
at net.minecraft.entity.Entity.func_70071_h_(Entity.java:387) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:quark.mixins.json:EntityMixin,pl:mixin:APP:imm_ptl_mixins.json:common.collision.MixinEntity,pl:mixin:APP:imm_ptl_mixins.json:client.MixinEntity_C,pl:mixin:A}
at net.minecraft.entity.LivingEntity.func_70071_h_(LivingEntity.java:2113) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:imm_ptl_mixins.json:common.MixinLivingEntity,pl:mixin:APP:imm_ptl_mixins.json:common.collision.MixinLivingEntity_C,pl:mixin:APP:imm_ptl_mixins.json:client.MixinLivingEntity_C,pl:mixin:A}
at net.minecraft.entity.MobEntity.func_70071_h_(MobEntity.java:300) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
at vazkii.quark.content.mobs.entity.StonelingEntity.func_70071_h_(StonelingEntity.java:122) ~[?:r2.4-303] {re:classloading}
at net.minecraft.client.world.ClientWorld.func_217418_a(ClientWorld.java:192) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:imm_ptl_mixins.json:client.MixinClientWorld,pl:mixin:APP:imm_ptl_mixins_forge.json:client.MixinClientWorld_MA,pl:mixin:APP:imm_ptl_peripheral_mixins.json:client.alternate_dimension.MixinClientWorld_A,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.world.ClientWorld$$Lambda$14355/1282811268.accept(Unknown Source) ~[?:?] {}
at net.minecraft.world.World.func_217390_a(World.java:554) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:imm_ptl_mixins.json:common.MixinWorld,pl:mixin:A}
at net.minecraft.client.world.ClientWorld.func_217419_d(ClientWorld.java:161) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:imm_ptl_mixins.json:client.MixinClientWorld,pl:mixin:APP:imm_ptl_mixins_forge.json:client.MixinClientWorld_MA,pl:mixin:APP:imm_ptl_peripheral_mixins.json:client.alternate_dimension.MixinClientWorld_A,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1483) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:imm_ptl_mixins.json:client.MixinMinecraftClient,pl:mixin:APP:imm_ptl_mixins.json:client.block_manipulation.MixinMinecraftClient_B,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:953) [?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:imm_ptl_mixins.json:client.MixinMinecraftClient,pl:mixin:APP:imm_ptl_mixins.json:client.block_manipulation.MixinMinecraftClient_B,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) [?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:imm_ptl_mixins.json:client.MixinMinecraftClient,pl:mixin:APP:imm_ptl_mixins.json:client.block_manipulation.MixinMinecraftClient_B,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:184) [?:?] {re:classloading,pl:runtimedistcleaner:A}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) [forge-1.16.5-36.0.14.jar:36.0] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$480/1979860449.call(Unknown Source) [forge-1.16.5-36.0.14.jar:36.0] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {}

Hello! Quark's moved to 1.18 now-- unfortunately, this means that (unless your bug is critical and/or game-breaking), we're closing support for issues filed for versions prior to it (e.g. Quark on 1.16).

If your issue still occurs on 1.18, or if your issue happens to be rather critical (e.g. consistently crashing the game with no other mods present), please leave another note or open a new issue. Thanks for your cooperation!