User blog comment:Kelerik/2014-06-26 4 Million Users Campaign, New Cards/@comment-24949969-20140627011709/@comment-173.246.21.174-20140628025331

I had this very same problem! I thought it because I recieved reward for a bugged FAW I killed but it was displayed as if she had full HP.

Either way, I can collect now, tho the game still crashes when checking past kills (after recieving rewards)