MaintenanceTool segfaulted during update, corrupting installation

On my Kubuntu 18.04 machine, I ran MaintenanceTool today, and selcted Update Components. It offered me to update Creator from 4.6 to 4.7, which I accepted. After working a while, it segfaulted, see log below. When restarting, it popped up a warning dialog that my installation was corrupt and I should reinstall from scratch.

Let me know if you want to see any files from this (now corrupted) installation.

[000] polyfemos:~$ ./Qt/MaintenanceTool  
{{[67149] Warning: It seems that this sender was not registered in the right way: QObject(0x0) }}
{{Segmentation fault (core dumped) }}
[139] polyfemos:~$ ./Qt/MaintenanceTool  
{{[7093] Critical: Operations missing for installed packages () }}
{{[7093] Critical: Orphaned operations ("qt.tools.qtcreator", "qt.tools.qtcreator.enterprise.plugins") }}
[60832] Warning: QXcbConnection: XCB error: 3 (BadWindow), sequence: 514, resource id: 29368898, major code: 40 (TranslateCoords), minor c
{{ode: 0 }}
{{[003] polyfemos:~$ }}
{{[000] polyfemos:~$ ./Qt/MaintenanceTool --version }}
{{IFW Version: 3.0.5, built with Qt 5.9.5. }}
{{Build date: Jun 12 2018 }}
Installer Framework SHA1: 59aa5f1