I see this error on Monaparty version. This will be reproduced on Counterwallet.
I'll send PR for fixing it later.
Uncaught TypeError: Cannot read property 'asset' of null
at ExchangeViewModel.<anonymous> (counterwallet-min.js?v=06e48d58e7e7:formatted:8475)
at h (counterwallet-deps-min.js?v=9f03958320d8:347)
at a.Fb.f [as za] (counterwallet-deps-min.js?v=9f03958320d8:347)
at Function.notifySubscribers (counterwallet-deps-min.js?v=9f03958320d8:347)
at Function.c.O (counterwallet-deps-min.js?v=9f03958320d8:347)
at c (counterwallet-deps-min.js?v=9f03958320d8:347)
at Object.va (counterwallet-deps-min.js?v=9f03958320d8:347)
at HTMLInputElement.e (counterwallet-deps-min.js?v=9f03958320d8:347)
at HTMLInputElement.dispatch (counterwallet-deps-min.js?v=9f03958320d8:11)
at HTMLInputElement.y.handle (counterwallet-deps-min.js?v=9f03958320d8:11)
I see this error on Monaparty version. This will be reproduced on Counterwallet. I'll send PR for fixing it later.