The crash occured after switching back to creator from another application, and pressing "cmd+," to open the preferences dialog.

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libProjectExplorer.dylib 0x000000010b5bf7b4 ProjectExplorer::DeviceManager::deviceCount() const + 4
1 libProjectExplorer.dylib 0x000000010b5c4ffb ProjectExplorer::DeviceManagerModel::handleDeviceListChanged() + 123
2 libProjectExplorer.dylib 0x000000010b5c4eb9 ProjectExplorer::DeviceManagerModel::DeviceManagerModel(ProjectExplorer::DeviceManager const*, QObject*) + 89
3 libProjectExplorer.dylib 0x000000010b5ca0f9 ProjectExplorer::Internal::DeviceSettingsWidget::DeviceSettingsWidget(QWidget*) + 105
4 libProjectExplorer.dylib 0x000000010b5cf5bd ProjectExplorer::Internal::DeviceSettingsPage::createPage(QWidget*) + 45
5 libCore.dylib 0x0000000106b86331 Core::Internal::SettingsDialog::ensureCategoryWidget(Core::Internal::Category*) + 481
6 libCore.dylib 0x0000000106b85fd2 Core::Internal::SettingsDialog::showCategory(int) + 50
7 libCore.dylib 0x0000000106b86990 Core::Internal::SettingsDialog::currentChanged(QModelIndex const&) + 64
8 QtCore 0x0000000100b9d6a1 QMetaObject::activate(QObject*, int, int, void**) + 2593
9 QtCore 0x0000000100b39335 QItemSelectionModel::setCurrentIndex(QModelIndex const&, QFlags<QItemSelectionModel::SelectionFlag>) + 389
10 QtWidgets 0x00000001002934d5 QAbstractItemView::setCurrentIndex(QModelIndex const&) + 181
11 libCore.dylib 0x0000000106b85c56 Core::Internal::SettingsDialog::showPage(QString const&, QString const&) + 1718
12 libCore.dylib 0x0000000106b875de Core::Internal::SettingsDialog::getSettingsDialog(QWidget*, QString const&, QString const&) + 254
13 libCore.dylib 0x0000000106b35c56 Core::Internal::MainWindow::showOptionsDialog(QString const&, QString const&, QWidget*) + 54
14 libCore.dylib 0x0000000106c13cb9 Core::Internal::MainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) + 953
15 QtCore 0x0000000100b9d6a1 QMetaObject::activate(QObject*, int, int, void**) + 2593
16 QtWidgets 0x0000000100087389 0x100065000 + 140169
17 QtCore 0x0000000100b9d6a1 QMetaObject::activate(QObject*, int, int, void**) + 2593
18 QtWidgets 0x0000000100087028 QAction::activate(QAction::ActionEvent) + 264
19 QtWidgets 0x00000001000873d8 0x100065000 + 140248
20 QtCore 0x0000000100b9d6a1 QMetaObject::activate(QObject*, int, int, void**) + 2593
21 com.apple.AppKit 0x00007fff8484aa59 -[NSApplication sendAction:to:from:] + 342
22 com.apple.AppKit 0x00007fff8498044c -[NSMenuItem _corePerformAction] + 406
23 com.apple.AppKit 0x00007fff8498013a -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 133
24 com.apple.AppKit 0x00007fff8497edc0 -[NSMenu performKeyEquivalent:] + 271
25 com.apple.AppKit 0x00007fff8497e283 -[NSApplication _handleKeyEquivalent:] + 829
26 com.apple.AppKit 0x00007fff8483b243 -[NSApplication sendEvent:] + 4480
27 com.apple.AppKit 0x00007fff847512fa -[NSApplication run] + 636
28 libqcocoa.dylib 0x00000001037149e5 0x103700000 + 84453
29 QtCore 0x0000000100b6d0d3 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 371
30 QtCore 0x0000000100b6fd75 QCoreApplication::exec() + 357
31 org.qt-project.qtcreator 0x000000010000b679 main + 19881
32 org.qt-project.qtcreator 0x0000000100004134 start + 52