Hi,
Inscape version: Inkscape 1.2.2 (1:1.2.2+202212051550+b0a8486541)
    GLib version:     2.64.6
    GTK version:      3.24.20
    glibmm version:   2.64.2
    gtkmm version:    3.24.2
    libxml2 version:  2.9.10
    libxslt version:  1.1.34
    Cairo version:    1.16.0
    Pango version:    1.44.7
    HarfBuzz version: 2.6.4

Linux version:    Linux Mint 20 Cinnamon (kernel: 5.15.0-56-generic)

When starting Inkscape from within a terminal I get following messages:
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.085: pango_layout_set_width: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.085: pango_layout_set_alignment: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.085: pango_layout_set_text: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.087: pango_layout_set_width: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.087: pango_layout_set_alignment: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.087: pango_layout_set_text: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.103: pango_layout_set_width: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.103: pango_layout_set_alignment: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.103: pango_layout_set_text: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.105: pango_layout_set_width: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.105: pango_layout_set_alignment: assertion 'layout != NULL' failed
  (org.inkscape.Inkscape:6366): Pango-CRITICAL **: 15:35:08.105: pango_layout_set_text: assertion 'layout != NULL' failed

Inscape starts and does what it has to do, I think, but:
-  What do the messages mean?
- Are they harmful?
- Can they be suppressed, solved, ....

When inscape is closed, it even produces more warnings and critical messages.

(org.inkscape.Inkscape:6366): GLib-GObject-WARNING **: 15:46:18.837: ../../../gobject/gsignal.c:2736: instance '0x5633a9ad22c0' has no handler with id '46090'
(org.inkscape.Inkscape:6366): GLib-GObject-WARNING **: 15:46:18.837: ../../../gobject/gsignal.c:2736: instance '0x5633a9ad22c0' has no handler with id '46091'
(org.inkscape.Inkscape:6366): GLib-GObject-WARNING **: 15:46:18.837: ../../../gobject/gsignal.c:2736: instance '0x5633a9ad22c0' has no handler with id '46092'
(org.inkscape.Inkscape:6366): GLib-GObject-WARNING **: 15:46:18.837: ../../../gobject/gsignal.c:2736: instance '0x5633a9ad22c0' has no handler with id '46093'
(org.inkscape.Inkscape:6366): Gtk-CRITICAL **: 15:46:18.847: gtk_notebook_get_tab_label: assertion 'list != NULL' failed
(org.inkscape.Inkscape:6366): Gtk-CRITICAL **: 15:46:18.851: gtk_notebook_get_tab_label: assertion 'list != NULL' failed
(org.inkscape.Inkscape:6366): Gtk-CRITICAL **: 15:46:18.853: gtk_notebook_get_tab_label: assertion 'list != NULL' failed
(org.inkscape.Inkscape:6366): Gtk-CRITICAL **: 15:46:18.855: gtk_notebook_get_tab_label: assertion 'list != NULL' failed
(org.inkscape.Inkscape:6366): GLib-GObject-WARNING **: 15:46:18.880: ../../../gobject/gsignal.c:2736: instance '0x5633a9ad22c0' has no handler with id '47737'
(org.inkscape.Inkscape:6366): GLib-GObject-WARNING **: 15:46:18.880: ../../../gobject/gsignal.c:2736: instance '0x5633a9ad22c0' has no handler with id '47738'
(org.inkscape.Inkscape:6366): GLib-GObject-WARNING **: 15:46:18.880: ../../../gobject/gsignal.c:2736: instance '0x5633a9ad22c0' has no handler with id '47739'
(org.inkscape.Inkscape:6366): GLib-GObject-WARNING **: 15:46:18.880: ../../../gobject/gsignal.c:2736: instance '0x5633a9ad22c0' has no handler with id '47740'
 

Again here the questions:

-  What do the messages mean?
- Are they harmful?
- Can they be suppressed, solved, ....