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java.lang.AssertionError: null
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java.lang.AssertionError: 	at io.netty.channel.embedded.EmbeddedChannel.writeOutbound(EmbeddedChannel.java:203)	at net.minecraftforge.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:97)	at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2723)	at de.teamlapen.vampirism.blocks.BlockHunterTable.onBlockActivated(BlockHunterTable.java:65)	at net.minecraft.server.management.PlayerInteractionManager.processRightClickBlock(PlayerInteractionManager.java:477)	at net.minecraft.network.NetHandlerPlayServer.processRightClickBlock(NetHandlerPlayServer.java:706)	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:68)	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:13)	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:15)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at net.minecraft.util.Util.runTask(Util.java:25)	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:742)	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:687)	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:536)	at java.lang.Thread.run(Thread.java:745)