Minecraft version - 1.20.1
Mod loader - neoforge-47.1.104
Mod version - BetterCombat 1.8.0

Describe the bug
Crashes when the respawn button is pressed after death.
Afterwards, when restarting and trying to enter the world again, it crashes.

Additional context
Crush report
java.lang.NullPointerException: Unexpected error
at java.util.Objects.requireNonNull(Objects.java:209) ~[?:?] {re:mixin}
at net.bettercombat.client.collision.TargetFinder.handler$bkm000$findAttackTargetResult(TargetFinder.java:533) ~[bettercombat-forge-1.8.0+1.20.1.jar%23329!/:?] {re:mixin,re:classloading,pl:mixin:APP:justleveling.mixins.json:MixTargetFinder,pl:mixin:A}
at net.bettercombat.client.collision.TargetFinder.findAttackTargetResult(TargetFinder.java) ~[bettercombat-forge-1.8.0+1.20.1.jar%23329!/:?] {re:mixin,re:classloading,pl:mixin:APP:justleveling.mixins.json:MixTargetFinder,pl:mixin:A}
at net.bettercombat.client.collision.TargetFinder.findAttackTargets(TargetFinder.java:80) ~[bettercombat-forge-1.8.0+1.20.1.jar%23329!/:?] {re:mixin,re:classloading,pl:mixin:APP:justleveling.mixins.json:MixTargetFinder,pl:mixin:A}
at net.minecraft.client.Minecraft.updateTargetsIfNeeded(Minecraft.java:3728) ~[client-1.20.1-20230612.114412-srg.jar%23464!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientAccessor,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientInject,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:globalpacks.mixins.json:MinecraftMixin,pl:mixin:APP:bookshelf.common.mixins.json:accessors.client.AccessorMinecraft,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:embeddiumextras.mixin.json:fps.GpuUsageMixin,pl:mixin:APP:pickupnotifier.common.mixins.json:client.MinecraftMixin,pl:mixin:APP:balm.mixins.json:MinecraftMixin,pl:mixin:APP:azurelib.forge.mixins.json:MinecraftMixin,pl:mixin:APP:embeddium.mixins.json:core.MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.handler$zzo000$pre_Tick(Minecraft.java:3747) ~[client-1.20.1-20230612.114412-srg.jar%23464!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientAccessor,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientInject,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:globalpacks.mixins.json:MinecraftMixin,pl:mixin:APP:bookshelf.common.mixins.json:accessors.client.AccessorMinecraft,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:embeddiumextras.mixin.json:fps.GpuUsageMixin,pl:mixin:APP:pickupnotifier.common.mixins.json:client.MinecraftMixin,pl:mixin:APP:balm.mixins.json:MinecraftMixin,pl:mixin:APP:azurelib.forge.mixins.json:MinecraftMixin,pl:mixin:APP:embeddium.mixins.json:core.MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91398_(Minecraft.java) ~[client-1.20.1-20230612.114412-srg.jar%23464!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientAccessor,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientInject,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:globalpacks.mixins.json:MinecraftMixin,pl:mixin:APP:bookshelf.common.mixins.json:accessors.client.AccessorMinecraft,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:embeddiumextras.mixin.json:fps.GpuUsageMixin,pl:mixin:APP:pickupnotifier.common.mixins.json:client.MinecraftMixin,pl:mixin:APP:balm.mixins.json:MinecraftMixin,pl:mixin:APP:azurelib.forge.mixins.json:MinecraftMixin,pl:mixin:APP:embeddium.mixins.json:core.MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1112) ~[client-1.20.1-20230612.114412-srg.jar%23464!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientAccessor,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientInject,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:globalpacks.mixins.json:MinecraftMixin,pl:mixin:APP:bookshelf.common.mixins.json:accessors.client.AccessorMinecraft,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:embeddiumextras.mixin.json:fps.GpuUsageMixin,pl:mixin:APP:pickupnotifier.common.mixins.json:client.MinecraftMixin,pl:mixin:APP:balm.mixins.json:MinecraftMixin,pl:mixin:APP:azurelib.forge.mixins.json:MinecraftMixin,pl:mixin:APP:embeddium.mixins.json:core.MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:718) ~[client-1.20.1-20230612.114412-srg.jar%23464!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientAccessor,pl:mixin:APP:bettercombat.mixins.json:client.MinecraftClientInject,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:globalpacks.mixins.json:MinecraftMixin,pl:mixin:APP:bookshelf.common.mixins.json:accessors.client.AccessorMinecraft,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:embeddiumextras.mixin.json:fps.GpuUsageMixin,pl:mixin:APP:pickupnotifier.common.mixins.json:client.MinecraftMixin,pl:mixin:APP:balm.mixins.json:MinecraftMixin,pl:mixin:APP:azurelib.forge.mixins.json:MinecraftMixin,pl:mixin:APP:embeddium.mixins.json:core.MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:218) ~[1.20.1-forge-47.1.104.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:126) ~[loader-47.2.2.jar:47.2] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.clientService(CommonLaunchHandler.java:114) ~[loader-47.2.2.jar:47.2] {}
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.runService(CommonClientLaunchHandler.java:24) ~[loader-47.2.2.jar:47.2] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.lambda$launchService$4(CommonLaunchHandler.java:108) ~[loader-47.2.2.jar:47.2] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}

Exactly, this is what happened when I installed the JustLeveling MOD.
It's a shame, because I really like the mod.

A glitch was reported over there as well. Let's wait for it to be improved.

JustLeveling is causing the crash.
It is trying to modify the code of Better Combat, which is unsafe, and it fails doing so.
Remove JustLeveling.