Observed on the 17/4/21 via analytics for 1.16.5-2.1:

Stacktrace:
java.lang.ArrayIndexOutOfBoundsException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:422) at java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:598) at java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:677) at java.util.concurrent.ForkJoinTask.invoke(ForkJoinTask.java:735) at java.util.concurrent.ConcurrentHashMap.forEachKey(ConcurrentHashMap.java:3824) at bassebombecraft.event.duration.DefaultDurationRepository.update(DefaultDurationRepository.java:25) at bassebombecraft.client.event.duration.DurationEventHandler.handleClientTickEvent(DurationEventHandler.java:26) at net.minecraftforge.eventbus.ASMEventHandler_184_DurationEventHandler_handleClientTickEvent_ClientTickEvent.invoke(.dynamic) at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) at net.minecraftforge.eventbus.EventBus$$Lambda$2532/1743305089.invoke(Unknown Source) at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) at net.minecraftforge.fml.hooks.BasicEventHooks.onPreClientTick(BasicEventHooks.java:105) at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1414) at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:953) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) at net.minecraft.client.main.Main.main(Main.java:184) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$472/2085601983.call(Unknown Source) at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) at --