[04:13:50] [File IO Thread/ERROR]: Failed to save chunk
java.lang.NullPointerException
	at net.minecraft.server.v1_9_R1.NBTTagCompound.a(SourceFile:392) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.NBTTagCompound.write(SourceFile:53) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.NBTTagList.write(SourceFile:45) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.NBTTagCompound.a(SourceFile:399) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.NBTTagCompound.write(SourceFile:53) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.NBTTagCompound.a(SourceFile:399) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.NBTTagCompound.write(SourceFile:53) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.NBTCompressedStreamTools.a(NBTCompressedStreamTools.java:70) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.NBTCompressedStreamTools.a(NBTCompressedStreamTools.java:63) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.ChunkRegionLoader.b(ChunkRegionLoader.java:182) ~[spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.ChunkRegionLoader.c(ChunkRegionLoader.java:164) [spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.FileIOThread.c(FileIOThread.java:35) [spigot.jar:git-Spigot-3af4605-ed8cef0]
	at net.minecraft.server.v1_9_R1.FileIOThread.run(FileIOThread.java:28) [spigot.jar:git-Spigot-3af4605-ed8cef0]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_74]