#1019 Program exits on trying to see Thieves Guild in Sorceress Castle

[Ghox]

Rev. 3269, steps to reproduce (savegame attached):
1. Open the Sorceress Castle (the second castle in the list).
2. Try to open (by clicking) the Thieves' Guild
Result:
Game program unexpectedly terminates and exits to the OS.

[SandySandy]

fixed, rev.3270
thanks you!