[21:36:47] [Server thread/ERROR]: 	Cause of unexpected exception was
java.lang.NullPointerException
	at net.minecraft.entity.EntityLiving.func_70623_bb(EntityLiving.java:546) ~[sw.class:?]
	at net.minecraft.entity.monster.EntitySlime.func_70626_be(EntitySlime.java:142) ~[ym.class:?]
	at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2127) ~[sv.class:?]
	at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:388) ~[sw.class:?]
	at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1954) ~[sv.class:?]
	at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:213) ~[sw.class:?]
	at net.minecraft.entity.monster.EntitySlime.func_70071_h_(EntitySlime.java:103) ~[ym.class:?]
	at net.minecraft.world.World.func_72866_a(World.java:2740) ~[ahb.class:?]
	at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:877) ~[mt.class:?]
	at net.minecraft.world.World.func_72870_g(World.java:2678) ~[ahb.class:?]
	at net.minecraft.world.World.func_72939_s(World.java:2480) ~[ahb.class:?]
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:673) ~[mt.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:986) ~[MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432) ~[lt.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:841) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]