[15:59:44] [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
java.util.ConcurrentModificationException: null
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) ~[?:1.8.0_242] {}
	at java.util.ArrayList$Itr.remove(ArrayList.java:873) ~[?:1.8.0_242] {}
	at com.blamejared.clumps.Clumps.update(Clumps.java:65) ~[clumps:6.0.0.17] {re:classloading}
	at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:247) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:239) ~[eventbus-4.0.0.jar:?] {}
	at com.performant.coremod.event.EventHandlerB.post(EventHandlerB.java:175) ~[performant:1.16.2-4-3.30m] {re:mixin,re:classloading}
	at com.performant.coremod.event.EventHandlerB.onPostWorldTick(EventHandlerB.java:74) ~[performant:1.16.2-4-3.30m] {re:mixin,re:classloading}
	at net.minecraftforge.fml.hooks.BasicEventHooks.onPostWorldTick(BasicEventHooks.java:524) ~[forge:?] {re:mixin,re:classloading,pl:mixin:APP:performant.mixins.json:forge.BasicEventHooksMixin,pl:mixin:A}
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:857) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:jaopca.mixins.json:MinecraftServerMixin,pl:mixin:A}
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:787) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:jaopca.mixins.json:MinecraftServerMixin,pl:mixin:A}
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:118) ~[?:?] {re:mixin,re:classloading,xf:OptiFine:default,pl:mixin:APP:smoothboot.mixins.json:client.IntegratedServerMixin,pl:mixin:APP:notenoughcrashes.mixins.json:client.MixinIntegratedServer,pl:mixin:A}
	at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:642) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:jaopca.mixins.json:MinecraftServerMixin,pl:mixin:A}
	at net.minecraft.server.MinecraftServer.lambda$startServer$0(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:structure_gel.mixins.json:MinecraftServerMixin,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:APP:jaopca.mixins.json:MinecraftServerMixin,pl:mixin:A}
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_242] {}