[02:16:38] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.ReportedException: Exception ticking world
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1810) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:473) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1596) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1302) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:329) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectArrayList.get(int)" because "this.wrapped" is null
	at it.unimi.dsi.fastutil.objects.ObjectOpenHashSet$SetIterator.next(ObjectOpenHashSet.java:575) ~[fastutil-8.5.12.jar:?]
	at org.bukkit.craftbukkit.entity.CraftPlayer.injectScaledMaxHealth(CraftPlayer.java:2873) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.level.ServerEntity.sendDirtyEntityData(ServerEntity.java:423) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.level.ServerEntity.sendChanges(ServerEntity.java:239) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.level.ChunkMap.newTrackerTick(ChunkMap.java:931) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.level.ChunkMap.tick(ChunkMap.java:952) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.level.ServerChunkCache.tick(ServerChunkCache.java:410) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:689) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1804) ~[paper-1.21.1.jar:1.21.1-132-b48403b]
	... 5 more