Navigation using telephone contacts

I try to navigate using my telephone contacts but get continuously message invalid address. My telephone is a Huawei p8 lite and my navigation is Smeg+iv2 (version smeg6.0.D.R.8) with 7 inch touch screen. I see the address (street, number, city) all separated by commas but also it already starts with a comma on the first position which is likely the reason for the message. I do get the option to correct it and store the corrected address in the system, but I prefer to have them correct in my phone.
Anyone an idea how to solve this.
Thanks.