Ah ok, now i understand.
At event OnActorCreated is no human player available. There only 'empty' actors are created.
A Player enters a plane (actor) with the OnPlaceEnter event:
Code:
public override void OnPlaceEnter(Player player, AiActor actor, int placeIndex)
{
base.OnPlaceEnter(player, actor, placeIndex);
//your code here
}