Frontend White List Vs Frontend Black List

Hello, great plugin!!! I start to enter lots of hackers’ IP addresses into “Frontend Black IP addresses” field. If I mistakenly enter wrong IP address from my customer. then My customer will not be able to access my site. I am wondering if I enter customer’s IP address into “Frontend White List” filed. Can my customer still access my site? in another words, is White List override Black List? please advise? Thank you

https://wordpress.org/plugins/iq-block-country/