Mission not ending

[eraea]

Hello guys. I signed up here because I am in quite a trouble.
Problem is, I got my base attacked by aliens and then after killing each one of them, ending my turn causes the game to turn over the turn to the aliens where they dont do anything and just give the turn back to me.

I saved in battlescape mode and tried aborting mission but it results to me losing my crew, base, and resources. Leaving me my newly constructed base that consists only of an Access lift.

Im at turn 77 right now and still nothing happens. Help would be appreciated.

[yrizoud]

An alien must be hiding somewhere.
Activate Debug mode and you'll see where he is during his turn.

[eraea]

Thank you!
It looks like the alien was trapped between some objects and couldnt move around.

[yrizoud]

Can you share a screenshot? (F12)