Losing Lp when someone afks

Im not sure if thats the right board but I'll put that just here. What im asking is simple. How is it fair when someone afks (in my case 10mins of a 15min game) that we still lose lp? How are we supposed to win a 4v5 in a teamgame ? Of course we got crushed with us getting annihilated and our stats dont look good. He just died 2 times and afked 10minutes and came back dying again. I mean is there no way of locking the lp for others?
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