[20:38:50] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: Index: 49, Size: 46
	at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_141]
	at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_141]
	at net.minecraft.util.Util.runTask(Util.java:54) [Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:796) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:741) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:590) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_141]
Caused by: java.lang.IndexOutOfBoundsException: Index: 49, Size: 46
	at java.util.ArrayList.rangeCheck(Unknown Source) ~[?:1.8.0_141]
	at java.util.ArrayList.get(Unknown Source) ~[?:1.8.0_141]
	at net.minecraft.inventory.Container.slotClick(Container.java:283) ~[Container.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processClickWindow(NetHandlerPlayServer.java:1212) ~[NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.CPacketClickWindow.processPacket(CPacketClickWindow.java:47) ~[CPacketClickWindow.class:?]
	at net.minecraft.network.play.client.CPacketClickWindow.processPacket(CPacketClickWindow.java:12) ~[CPacketClickWindow.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_141]
	at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_141]
	at net.minecraft.util.Util.runTask(Util.java:53) ~[Util.class:?]
	... 5 more