d

[19:11:40] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_131]
	at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_131]
	at net.minecraft.util.Util.runTask(Util.java:30) [Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:754) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:699) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:548) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]
Caused by: java.lang.NullPointerException
	at net.minecraft.network.datasync.EntityDataManager.set(EntityDataManager.java:156) ~[EntityDataManager.class:?]
	at net.minecraft.entity.EntityLivingBase.setHealth(EntityLivingBase.java:929) ~[EntityLivingBase.class:?]
	at net.minecraft.entity.EntityLivingBase.<init>(EntityLivingBase.java:200) ~[EntityLivingBase.class:?]
	at net.minecraft.entity.EntityLiving.<init>(EntityLiving.java:102) ~[EntityLiving.class:?]
	at net.minecraft.entity.EntityCreature.<init>(EntityCreature.java:22) ~[EntityCreature.class:?]
	at net.minecraft.entity.monster.EntityMob.<init>(EntityMob.java:26) ~[EntityMob.class:?]
	at me.creepinson.entity.EntityMovingBlock.<init>(EntityMovingBlock.java:47) ~[EntityMovingBlock.class:?]
	at me.creepinson.block.CreepinoSkull.onBlockActivated(CreepinoSkull.java:44) ~[CreepinoSkull.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.processRightClickBlock(PlayerInteractionManager.java:473) ~[PlayerInteractionManager.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processTryUseItemOnBlock(NetHandlerPlayServer.java:712) ~[NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:68) ~[CPacketPlayerTryUseItemOnBlock.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:13) ~[CPacketPlayerTryUseItemOnBlock.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) ~[PacketThreadUtil$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_131]
	at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_131]
	at net.minecraft.util.Util.runTask(Util.java:29) ~[Util.class:?]
	... 5 more