App doesn't save data in a session on random mac laptops in Chrome

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My app is built using sessions and for some undefined reason on some mac computers my app doesn't write data in session 
This app is based on Codeigniter, and as I said it happens only on few mac computers (on other devices it works well) and in fact it throws some app's internal page that doesn't allow to use entire app.

It worked well in ALL on all devices for a few months and the first time when the problem appeared was this Monday.