When i get incoming call, i answer it but nothing happends.

Clicking "Answer", then opens next pop-up

Then i click "OK"
After that pop-op disapears but phone (Sony Xperia Z5 Compact - Android 5.1.1) keeps ringing and nothing happens.
Got this problem with Airdroid Win and Airdroid Web
How to fix this problem?

Clicking "Answer", then opens next pop-up

Then i click "OK"
After that pop-op disapears but phone (Sony Xperia Z5 Compact - Android 5.1.1) keeps ringing and nothing happens.
Got this problem with Airdroid Win and Airdroid Web
How to fix this problem?