Completing a task causes Planify to freeze

[AmagicalFishy]

Describe the bug
Completing a task by clicking on a checkbox completely freezes Planify

There's nothing special about this bug—completing a task freezes the program entirely. I've tried removing the database and uninstalling and reinstalling (both the AUR version and Flatpak).

This error comes up often:

(io.github.alainm23.planify:2): Gtk-CRITICAL **: 23:17:06.769: gtk_widget_remove_css_class: assertion 'GTK_IS_WIDGET (widget)' failed

** (io.github.alainm23.planify:2): CRITICAL **: 23:17:06.792: widgets_sub_items_get_has_children: assertion 'self != NULL' failed

** (io.github.alainm23.planify:2): CRITICAL **: 23:17:06.793: widgets_calendar_calendar_view_date: assertion 'date != NULL' failed

** (io.github.alainm23.planify:2): CRITICAL **: 23:17:06.793: widgets_calendar_calendar_view_date: assertion 'date != NULL' failed

(io.github.alainm23.planify:2): Gtk-CRITICAL **: 23:17:06.793: gtk_widget_remove_css_class: assertion 'GTK_IS_WIDGET (widget)' failed

** (io.github.alainm23.planify:2): CRITICAL **: 23:17:06.815: widgets_sub_items_get_has_children: assertion 'self != NULL' failed

** (io.github.alainm23.planify:2): CRITICAL **: 23:17:06.816: widgets_calendar_calendar_view_date: assertion 'date != NULL' failed

** (io.github.alainm23.planify:2): CRITICAL **: 23:17:06.816: widgets_calendar_calendar_view_date: assertion 'date != NULL' failed

[alainm23]

This is very strange. Are you using a local task, Todoist, or Nextcloud? Is there anything else to consider about the task — maybe it has a due date, priority, or description? I honestly haven’t been able to reproduce this error.