Bot crashes details.assetid === 'undefined'

[SeMaKKa]

Hello after sending 1 trade offer it's time to send second one back but getting this error. what does it means? 

C:\node-steam-trade-farm-master>node bot
Main Client Logged In!
Bot Client Logged In!
The item in which we are using is a/an blue tshirt
Trade offered. Counter is at : 0
Trade #1
Second Account found an Offer!
Second Account, has accepted trade. Now sending it back.
C:\node-steam-trade-farm-master\node_modules\steam-tradeoffer-manager\lib\classe
s\TradeOffer.js:254
        if (typeof details.appid === 'undefined' || typeof details.contextid ===
 'undefined' || (typeof details.assetid === 'undefined' && typeof details.id ===
 'undefined')) {
                          ^

TypeError: Cannot read property 'appid' of undefined
    at addItem (C:\node-steam-trade-farm-master\node_modules\steam-tradeoffer-ma
nager\lib\classes\TradeOffer.js:254:20)
    at TradeOffer.addMyItem (C:\node-steam-trade-farm-master\node_modules\steam-
tradeoffer-manager\lib\classes\TradeOffer.js:167:9)
    at botManager.getInventoryContents (C:\node-steam-trade-farm-master\bot.js:1
84:25)
    at SteamCommunity.<anonymous> (C:\node-steam-trade-farm-master\node_modules\
steamcommunity\components\users.js:464:5)
    at Request._callback (C:\node-steam-trade-farm-master\node_modules\steamcomm
unity\components\http.js:67:15)
    at Request.self.callback (C:\node-steam-trade-farm-master\node_modules\reque
st\request.js:185:22)
    at emitTwo (events.js:106:13)
    at Request.emit (events.js:191:7)
    at Request.<anonymous> (C:\node-steam-trade-farm-master\node_modules\request
\request.js:1161:10)
    at emitOne (events.js:96:13)

[SeMaKKa]

I Fixed That...