Bug 510283

***
If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org

If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports

Please remove this comment after reading and before submitting - thanks!
***

SUMMARY


STEPS TO REPRODUCE
1. Fresh installation of Merkuro (never been installed on this CachyOS intall before)
2. Added Nextcloud Caldav/Carddav account (two different calendars provided - a group shared calendar and a personal calendar, both set up via Nextcloud's calendar interface) and some readonly ICS calendars. 
3. Move an existing Nextcloud event to a different day
4. Double click or right-click > edit the event that was moved

OBSERVED RESULT

Mercuro Calendar crashes

EXPECTED RESULT

Edit Event interface should appear

SOFTWARE/OS VERSIONS
Merkuro Calendar: 25.08.1
CachyOS (Wayland)
KDE Frameworks: 6.18.0
Qt: Using 6.9.2 and built against 6.9.2
Unknown/Default
Build ABI: x86_64-little_endian-lp64
Kernel: linux 6.17.0-4-cachyos

ADDITIONAL INFORMATION
KDE Plasma: 6.4.5
KWin (Wayland)
RAM: 32GB

I also tried creating a new event from within Merkuro Calendar and then editing it which resulted in the same crashing behaviour.

Starting Merkuro from konsole and performing the above steps results in this terminal output:

❯ merkuro-calendar 
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Main.qml:701:9: QML ScheduleView: Created graphical object was not placed in the graphics scene.
qrc:/qt/qml/org/kde/merkuro/calendar/qml/MainViews/BasicMonthListView.qml:194:21: QML Button: Binding loop detected for property "implicitWidth":
qrc:/qt/qml/org/kde/desktop/Button.qml:20:5
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Main.qml:677:9: QML MonthView: Created graphical object was not placed in the graphics scene.
Could not find any constructor for value type QQuickColorValueType to call with value QVariant(Invalid)
Could not find any constructor for value type QQuickColorValueType to call with value QVariant(Invalid)
qrc:/qt/qml/org/kde/kirigamiaddons/components/ConvergentContextMenu.qml:274:9: QML ActionsMenu: cannot show menu: parent is null
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Dialogs/IncidenceEditorPage.qml:397:17: QML ComboBox: Binding loop detected for property "currentIndex":
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Dialogs/IncidenceEditorPage.qml:406:21
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Dialogs/IncidenceEditorPage.qml:397:17: QML ComboBox: Binding loop detected for property "currentIndex":
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Dialogs/IncidenceEditorPage.qml:406:21
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Dialogs/IncidenceEditorPage.qml:163:17: QML CollectionComboBox: Binding loop detected for property "implicitHeight":
qrc:/qt/qml/org/kde/desktop/ComboBox.qml:24:5
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Dialogs/IncidenceEditorPage.qml:191:17: QML TextField: Binding loop detected for property "text":
qrc:/qt/qml/org/kde/merkuro/calendar/qml/Dialogs/IncidenceEditorPage.qml:203:21
fish: Job 1, 'merkuro-calendar' terminated by signal SIGSEGV (Address boundary error)

Using gdb, I get:

Thread 1 "merkuro-calenda" received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()

I realise that's unhelpful but I'm ill at the moment. Once I feel well enough (and if it's still needed), I'll build Merkuro with debug flags and post results here.