Rock Bottom Crash

java.lang.IndexOutOfBoundsException: readerIndex(0) + length(4) exceeds writerIndex(0): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 0, widx: 0, cap: 256)
	at io.netty.buffer.AbstractByteBuf.checkReadableBytes0(AbstractByteBuf.java:1396)
	at io.netty.buffer.AbstractByteBuf.readInt(AbstractByteBuf.java:766)
	at de.ellpeck.rockbottom.api.tile.entity.TileEntityFueled.fromBuf(TileEntityFueled.java:123)
	at de.ellpeck.rockbottom.world.tile.entity.TileEntitySeparator.fromBuf(TileEntitySeparator.java:162)
	at de.ellpeck.rockbottom.api.net.packet.toclient.PacketTileEntityData.lambda$handle$4(PacketTileEntityData.java:70)
	at de.ellpeck.rockbottom.RockBottom.update(RockBottom.java:259)
	at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:652)
	at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
	at de.ellpeck.rockbottom.Container.gameLoop(Container.java:107)
	at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
	at de.ellpeck.rockbottom.RockBottom.init(RockBottom.java:128)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at de.ellpeck.rockbottom.Main.main(Main.java:81)
[11:26:46.637] [ERROR]
org.newdawn.slick.SlickException: Game.update() failure - check the game code.
	at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:669)
	at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
	at de.ellpeck.rockbottom.Container.gameLoop(Container.java:107)
	at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
	at de.ellpeck.rockbottom.RockBottom.init(RockBottom.java:128)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at de.ellpeck.rockbottom.Main.main(Main.java:81)