TITANIC: Crash when taking service elevator to bottom of keel

[dafioram]

After you have finished the prologue if you take the service lift down to the bottom of the keel the game will crash.

1.10.0git-4738-gf36f394

#0  0x00000000005698e0 in Titanic::AVISurface::copyMovieFrame (this=0x202d030,     src=..., dest=...) at engines/titanic/support/avi_surface.cpp:304
#1  0x0000000000569ea9 in Titanic::AVISurface::renderFrame (this=0x202d030)  at engines/titanic/support/avi_surface.cpp:391
#2  0x00000000005694c8 in Titanic::AVISurface::handleEvents (this=0x202d030,     events=...) at engines/titanic/support/avi_surface.cpp:227
#3  0x000000000052ace4 in Titanic::OSMovie::handleEvents (this=0x202d020,     events=...) at engines/titanic/support/movie.cpp:168
#4  0x000000000054abb3 in Titanic::CGameManager::updateMovies (this=0x1a0d690)    at engines/titanic/game_manager.cpp:235
#5  0x000000000054a82b in Titanic::CGameManager::update (this=0x1a0d690)    at engines/titanic/game_manager.cpp:170
#6  0x000000000054efa7 in Titanic::CMainGameWindow::mouseChanged (    this=0x149b150) at engines/titanic/main_game_window.cpp:235
#7  0x000000000054f0a9 in Titanic::CMainGameWindow::mouseMove (this=0x149b150,     mousePos=...) at engines/titanic/main_game_window.cpp:269
#8  0x00000000005491ed in Titanic::Events::pollEvents (this=0x1498f70)    at engines/titanic/events.cpp:106
#9  0x000000000054922c in Titanic::Events::pollEventsAndWait (this=0x1498f70)    at engines/titanic/events.cpp:112
#10 0x00000000004230c5 in Titanic::TitanicEngine::run (this=0x1337740)    at engines/titanic/titanic.cpp:152
#11 0x000000000040df8e in runGame (plugin=0xc22780, system=...,  ) at base/main.cpp:263
#12 0x000000000040f151 in scummvm_main (argc=1, argv=0x7fffffffdf38) at base/main.cpp:529
#13 0x000000000040c0fe in main (argc=1, argv=0x7fffffffdf38) at backends/platform/sdl/posix/posix-main.cpp:45