MacBook constantly blocking WiFi for iPhone

Hi guys,

I’m just trying to solve new issue what I got few days ago and I don’t know how to solve it.

Problem is, that I can connect to my wifi on iPhone, but with no internet access. I have to turn off wifi on my MacBook Air and than it’s working. Router showed me that both devices are connected but something is blocking my internet access on iPhone when WiFi is on MacBook also and I don’t know what. And it’ll be something in MacBook.