Lost a stone of the ancestors (Gothic 3)

In General, I took the stone of the ancestors in Nordmar. Everything was fine. But when we had to put it on the altar in the tomb of Einar found that he was gone. Spawny this stone in equipping — it is not, although the console says that has been spawned in invertase. When you try to put a stone GG crouches and pokes a hand into the altar, but nothing happens. What to do?