crash when starting supply scenario

[sparr]

This happens after clicking "Create", before the screen changes otherwise, while still looking at the scenario list:

Thread 3 Crashed:
0 com.factorio.factorio 0x0000000100256864 ScenarioMessageDialog::updatePosition(GuiArrowSpecification const&) + 132
1 com.factorio.factorio 0x00000001002565fa ScenarioMessageDialog::ScenarioMessageDialog(ScenarioMessageDialogData const&) + 874
2 com.factorio.factorio 0x00000001001ae646 GameView::loadGui() + 390
3 com.factorio.factorio 0x00000001001adff0 GameView::GameView(Game*, Player*, bool) + 448
4 com.factorio.factorio 0x000000010019ef17 Game::Game(Map*, InputType::Enum, InputHandler*, bool) + 311
5 com.factorio.factorio 0x000000010006d6cc AppManager::createGame(ScenarioExecutionContext const&, boost::function<void ()>) + 348
6 com.factorio.factorio 0x0000000100068dde AppManager::processNewGameDialog() + 174
7 com.factorio.factorio 0x0000000100066038 AppManager::process(bool&) + 472
8 com.factorio.factorio 0x00000001002b36b3 tickStep(boost::cpu_timer&, boost::cpu_timer&, bool) + 83
9 com.factorio.factorio 0x00000001002b4401 run(char*, bool) + 305
10 com.factorio.factorio 0x00000001002b5ba7 _al_mangled_main + 4551
11 com.factorio.factorio 0x0000000100668537 +[AllegroAppDelegate app_main:] + 23
12 com.apple.Foundation 0x00007fff906da70b __NSThread__main__ + 1318
13 libsystem_pthread.dylib 0x00007fff921ca899 _pthread_body + 138
14 libsystem_pthread.dylib 0x00007fff921ca72a _pthread_start + 137
15 libsystem_pthread.dylib 0x00007fff921cefc9 thread_start + 13

[cube]

Thanks for the report, this is fixed for 0.9.2