error

[SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'cr' in plugin ChestRestock v2.3-SNAPSHOT-b49
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:473)
	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)
	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)
	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:551)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NullPointerException
	at net.minecraft.server.ItemStack.setData(ItemStack.java:153)
	at net.minecraft.server.ItemStack.<init>(ItemStack.java:39)
	at org.bukkit.craftbukkit.inventory.CraftItemStack.<init>(CraftItemStack.java:61)
	at org.bukkit.craftbukkit.inventory.CraftItemStack.<init>(CraftItemStack.java:49)
	at org.bukkit.craftbukkit.inventory.CraftItemStack.<init>(CraftItemStack.java:27)
	at org.bukkit.craftbukkit.inventory.CraftInventory.firstPartial(CraftInventory.java:229)
	at org.bukkit.craftbukkit.inventory.CraftInventory.addItem(CraftInventory.java:255)
	at com.dumptruckman.chestrestock.DefaultLootTable.addSectionToInventory(DefaultLootTable.java:47)
	at com.dumptruckman.chestrestock.DefaultLootTable.addSectionToInventory(DefaultLootTable.java:67)
	at com.dumptruckman.chestrestock.DefaultLootTable.addSectionToInventory(DefaultLootTable.java:84)
	at com.dumptruckman.chestrestock.DefaultLootTable.addSectionToInventory(DefaultLootTable.java:84)
	at com.dumptruckman.chestrestock.DefaultLootTable.addToInventory(DefaultLootTable.java:28)
	at com.dumptruckman.chestrestock.DefaultCRChest.restock(DefaultCRChest.java:225)
	at com.dumptruckman.chestrestock.DefaultCRChest.restockAllInventories(DefaultCRChest.java:234)
	at com.dumptruckman.chestrestock.DefaultChestManager.restockAllChests(DefaultChestManager.java:342)
	at com.dumptruckman.chestrestock.command.RestockAllCommand.runCommand(RestockAllCommand.java:47)
	at com.dumptruckman.chestrestock.pluginbase.util.commandhandler.CommandHandler.checkAndRunCommand(CommandHandler.java:223)
	at com.dumptruckman.chestrestock.pluginbase.util.commandhandler.CommandHandler.processFoundCommands(CommandHandler.java:120)
	at com.dumptruckman.chestrestock.pluginbase.util.commandhandler.CommandHandler.locateAndRunCommand(CommandHandler.java:70)
	at com.dumptruckman.chestrestock.pluginbase.util.commandhandler.CommandHandler.locateAndRunCommand(CommandHandler.java:48)
	at com.dumptruckman.chestrestock.pluginbase.plugin.AbstractBukkitPlugin.onCommand(AbstractBukkitPlugin.java:141)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	... 12 more