Google Analytics shows avg. session duration, sometimes 00:00:00 sometimes true

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Sep 29, 2016 4:01:17 AM via Website

I integrated google anaylitics into my android game 5 days ago and published. Yesterday, I noticed that many sessions'(almost half of all sessions) duration is 00:00:00. Rest of sessions seems normal, no problem. My game has just 1 activity, it uses swipe tabs.
What is the main reason? How to solve?