Thank you for your bug report, what Ubuntu version and gnome-calendar
package are you using? Could you get a debug backtrace as described on
https://wiki.ubuntu.com/DebuggingProgramCrash

** Changed in: gnome-calendar (Ubuntu)
   Importance: Undecided => Low

** Changed in: gnome-calendar (Ubuntu)
       Status: New => Incomplete

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-calendar in Ubuntu.
https://bugs.launchpad.net/bugs/1846541

Title:
  sigsegv in gtk_widget_get_scale_factor

Status in gnome-calendar package in Ubuntu:
  Incomplete

Bug description:
  Occasionally when launching the calendar from the overview, it
  segfaults at startup. This does not seem to happen when launched from
  the terminal. Logs from journald:

  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:50 pop-os gnome-calendar[8992]: gtk_widget_get_scale_factor: 
assertion 'GTK_IS_WIDGET (widget)' failed
  Oct 03 11:37:51 pop-os kernel: gnome-calendar[8992]: segfault at 1 ip 
00007f289e26bc7d sp 00007ffce534fa60 error 4 in 
libglib-2.0.so.0.6200.0[7f289e218000+83000]

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