Failure sometime when closing game

[Václav]

It is not appearing everytime - but it is appearing sometime when game is closed. Game fails.

Bug report is from nightly 6154 - but in current nightly it is the same.

[Dwachs]

Does it happen when you
(a) load, save savegame, end return
(b) only load a game and quit
(c) only save a new game and quit?

[Václav]

(d) - only save old game and quit