gnome-calendar crashes disabling/enabling or removing/readding calendar (Signal 6)

[ajg]

Gnome-calendar crashes reliably under two conditions.

First

1. Open GNOME Calendar
2. Goto Manage your calendars
3. Disable the display one of the calendars
4. Renenable it

Second

1. Open GNOME Calendar
2. Goto Manage your calendars
3. Goto Manage Calendars ...
4. Select one calendar
5. Remove calendar
6. Close Window "Manage Calendars"
7. Goto Manage your calendars
8. Goto Manage Calendars ...
9. Choose "Add Calendar..."
10. Selected calendar file removed in step 5 via file selection dialog

This is gnome-calendar 3.36.2 under up to date ubuntu 20.04

If I start gnome-calendar from a terminal I get as error messages:

GcalTimeline:ERROR:../src/core/gcal-timeline.c:212:increase_completed_calendars: assertion failed: (self->completed_calendars <= g_hash_table_size (self->calendars))
Bail out! GcalTimeline:ERROR:../src/core/gcal-timeline.c:212:increase_completed_calendars: assertion failed: (self->completed_calendars <= g_hash_table_size (self->calendars))
Aborted (core dumped)

These are the same in both cases.

[ajg (goesele)]

I solved the problem for myself by commenting out the offending line (212) from gcal-timeline.c and building and installing my own package. I don't know whether this could count as a real solution, but one doesn't lose anything except crashes.