Payout Items to the Admin

I made a command, that simply calls UserHandler.Trade.AddItemByDefindex(5000) to add an scrap. If I call this a second time, it crashes with the following log:

[spyfly's Keybot 2014-12-28 15:28:30] WARN: Message in the chat: .addscrap [spyfly's Keybot 2014-12-28 15:28:31] SUCCESS: Current stock: I have 1.21 ref (0 ref, 0 rec, and 11 scrap) and 2 key(s) in my backpack. [spyfly's Keybot 2014-12-28 15:28:31] WARN: I added Scrap Metal. [spyfly's Keybot 2014-12-28 15:28:34] WARN: Message in the chat: .addscrap [spyfly's Keybot 2014-12-28 15:28:34] ERROR: Unhandled exceptions in bot spyfly's Keybot callback thread: SteamTrade.Exceptions.TradeException: The Web command to add the Item failed at SteamTrade.Trade.AddItem (SteamTrade.TradeWebAPI.TradeUserAssets item) [0x00000] in <filename unknown>:0 at SteamTrade.Trade.AddItem (UInt64 itemid) [0x00000] in <filename unknown>:0 at SteamTrade.Trade.AddItemByDefindex (Int32 defindex) [0x00000] in <filename unknown>:0 at SteamBot.KeyUserHandler.OnMessage (System.String message, EChatEntryType type) [0x00000] in <filename unknown>:0 at SteamBot.Bot.<HandleSteamMessage>b__8 (SteamKit2.FriendMsgCallback callback) [0x00000] in <filename unknown>:0 at SteamKit2.CallbackMsg.Handle[FriendMsgCallback] (System.Action`1 handler) [0x00000] in <filename unknown>:0 at SteamBot.Bot.HandleSteamMessage (SteamKit2.CallbackMsg msg) [0x00000] in <filename unknown>:0 at SteamBot.Bot.BackgroundWorkerOnDoWork (System.Object sender, System.ComponentModel.DoWorkEventArgs doWorkEventArgs) [0x00000] in <filename unknown>:0 at System.ComponentModel.BackgroundWorker.OnDoWork (System.ComponentModel.DoWorkEventArgs e) [0x00000] in <filename unknown>:0 at System.ComponentModel.BackgroundWorker.ProcessWorker (System.Object argument, System.ComponentModel.AsyncOperation async, System.Threading.SendOrPostCallback callback) [0x00000] in <filename unknown>:0

/r/SteamBot Thread