Creator crashes with InvalidModelNodeException when saving a file

I have a fairly big QtQuick project, and I'm trying to work on in with QtCreator (Qt Creator 4.4.1 based on Qt 5.9.2, on Ubuntu 16.04)
On saving one of the files in the project (or sometimes just editing it...) QtCreator crashes completely, and this is fairly consistent.

The attached file is the qml that seems to be the problem.
Running from the command line, I get to see an error dumped to the console as it crashes

{{Exception: "InvalidModelNodeException" Function: "selectedNodes" File: "/work/build/qt-creator/src/plugins/qmldesigner/designercore/model/model.cpp" Line: 1452 "file: /work/build/qt-creator/src/plugins/qmldesigner/designercore/model/model.cpp, function: selectedNodes, line: 1452" " /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugin/libQmlDesigner.so(ZN11QmlDesigner9ExceptionC2EiRK10QByteArrayS3+0xc8) [0x7f613f9c0698] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(ZN11QmlDesigner25InvalidModelNodeExceptionC1EiRK10QByteArrayS3+0xe) [0x7f613f9c13ae] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x16089b) [0x7f613f9a589b] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(ZNK11QmlDesigner12AbstractView26hasSingleSelectedModelNodeEv+0x17) [0x7f613f971827] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x2bddc4) [0x7f613fb02dc4] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(_ZN11QmlDesigner14AbstractAction13updateContextEv+0x3c) [0x7f613fa351bc] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x1efc69) [0x7f613fa34c69] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x15ea58) [0x7f613f9a3a58] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x165c34) [0x7f613f9aac34] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(_ZN11QmlDesigner15VariantProperty26setDynamicTypeNameAndValueERK10QByteArrayRK8QVariant+0x26d) [0x7f613f9c417d] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x1911fe) [0x7f613f9d61fe] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x1940f3) [0x7f613f9d90f3] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x19ad48) [0x7f613f9dfd48] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(+0x19d7c8) [0x7f613f9e27c8] /home/pete/Qt/Tools/QtCreator/lib/qtcreator/plugins/libQmlDesigner.so(_ZN11QmlDesigner12RewriterView12amendQmlTextEv+0x4e) [0x7f613f974a7e] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN11QMetaObject8activateEP7QObjectiiPPv+0x986) [0x7f615dbbbb96] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN6QTimer7timeoutENS_14QPrivateSignalE+0x27) [0x7f615dbc8057] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN6QTimer10timerEventEP11QTimerEvent+0x28) [0x7f615dbc8328] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN7QObject5eventEP6QEvent+0x7b) [0x7f615dbbc77b] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Widgets.so.5(_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent+0x9c) [0x7f615eeed5ec] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Widgets.so.5(_ZN12QApplication6notifyEP7QObjectP6QEvent+0x227) [0x7f615eef4a17] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent+0x108) [0x7f615db912b8] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN14QTimerInfoList14activateTimersEv+0x46e) [0x7f615dbe308e] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(+0x2cb8a9) [0x7f615dbe38a9] /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x2a7) [0x7f6159709197] /lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4a3f0) [0x7f61597093f0] /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x2c) [0x7f615970949c] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE+0x5f) [0x7f615dbe3baf] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE+0xea) [0x7f615db8f8aa] /home/pete/Qt/Tools/QtCreator/bin/../lib/Qt/lib/libQt5Core.so.5(_ZN16QCoreApplication4execEv+0x84) [0x7f615db98134] /home/pete/Qt/Tools/QtCreator/bin/qtcreator() [0x409aa7] /lib/x86_64-linux-gnu/libc.so.6(_libc_start_main+0xf0) [0x7f615c83e830] /home/pete/Qt/Tools/QtCreator/bin/qtcreator() [0x40a401] " terminate called after throwing an instance of 'QmlDesigner::InvalidModelNodeException*' Aborted }}