How to make pp_express work in 2.0.3.1 without error messages

Hi
I'm managed to get the pp_express payment module working in my 2.0.3.1 store by removing the references to option_value in the code.

My problem is that I really don't like errors in my store, as I always worry that the customer might not be getting the best experience.

I occasionally still get pp_express errors in the error log - although the pp_express module is working.
The errors are always undefined index errors, and I think they are appearing only when registered customers are logged into the store.
an example is payment_address

Does anyone have pp_express working correctly, without errors in 2.0.3.1?