Qt Wayland Compositor crashes when a client terminates with virtualkeyboard on

Step to reproduce:

1. Set QT_IM_MODULE=qtvirtualkeyboard
2. Launch the wayland example pure-qml compositor
3. Launch any Qt app onto that compositor (e.g. qt quick controls 2 gallery)
4. Click on any text field to open the virtual keyboard
5. Press Ctrl+C on the console of Qt app on your physical keyboard (or send SIGTERM to it)

The compositor will then crash with Segmentation Fault. Please find the relevant crash stack trace in the attachment.