[21:00:58] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_8_R3.ReportedException: Exception ticking world
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:780) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]
Caused by: java.util.NoSuchElementException
	at java.util.TreeMap.key(TreeMap.java:1327) ~[?:1.8.0_161]
	at java.util.TreeMap.firstKey(TreeMap.java:290) ~[?:1.8.0_161]
	at java.util.TreeSet.first(TreeSet.java:394) ~[?:1.8.0_161]
	at org.bukkit.craftbukkit.v1_8_R3.util.HashTreeSet.first(HashTreeSet.java:114) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.WorldServer.a(WorldServer.java:629) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:249) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:769) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	... 4 more
[21:00:58] [Server thread/ERROR]: 	Cause of unexpected exception was
java.util.NoSuchElementException
	at java.util.TreeMap.key(TreeMap.java:1327) ~[?:1.8.0_161]
	at java.util.TreeMap.firstKey(TreeMap.java:290) ~[?:1.8.0_161]
	at java.util.TreeSet.first(TreeSet.java:394) ~[?:1.8.0_161]
	at org.bukkit.craftbukkit.v1_8_R3.util.HashTreeSet.first(HashTreeSet.java:114) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.WorldServer.a(WorldServer.java:629) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:249) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:769) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) ~[Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [Spigot-v1_8_8.jar:git-Spigot-0359393-9cd1111]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]