15:47:52 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'cr' in plugin ChestRestock v2.3.1-SNAPSHOT-b99
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:510)
        at net.minecraft.server.v1_4_6.PlayerConnection.handleCommand(PlayerConnection.java:980)
        at net.minecraft.server.v1_4_6.PlayerConnection.chat(PlayerConnection.java:898)
        at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:853)
        at net.minecraft.server.v1_4_6.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
        at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
        at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
        at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:598)
        at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
        at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
        at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
        at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.IllegalArgumentException: Cannot copy null stack
        at org.apache.commons.lang.Validate.notNull(Validate.java:203)
        at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:120)
        at com.dumptruckman.chestrestock.DefaultCRChest.update(DefaultCRChest.java:113)
        at com.dumptruckman.chestrestock.DefaultChestManager.createChest(DefaultChestManager.java:205)
        at com.dumptruckman.chestrestock.command.CreateCommand.runCommand(CreateCommand.java:33)
        at com.dumptruckman.chestrestock.command.TargetedChestRestockCommand.runCommand(TargetedChestRestockCommand.java:36)
        at com.dumptruckman.chestrestock.pluginbase.util.commandhandler.CommandHandler.checkAndRunCommand(CommandHandler.java:234)
        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:44)
        ... 15 more