Bad app author signature followed by Gtk:Error results in Segfault

[canadaduane]

Currently, Pop! Shop won't open due to the following Segfault after each initial launch attempt:

Nov 24 16:51:00 rosie io.elementary.a[1351229]: FlatpakBackend.vala:1006: Unable to update remote: Signature made Thu 24 Oct 2019 09:31:59 AM MDT using RSA key ID B3C7CE210DE76DFC
                                                BAD signature from "TingPing <[email protected]>"
                                                Key expired Tue 12 Feb 2019 01:00:50 PM MST
Nov 24 16:51:01 rosie io.elementary.a[1351229]: FlatpakBackend.vala:1015: Unable to update appstream: Error updating appstream2: No such ref 'appstream2/x86_64' in remote gnomempv-origin; Error updating appstream: No such ref 'appstream/x86_64' in remote gnomempv-origin
Nov 24 16:51:09 rosie io.elementary.a[1351229]: app_center_widgets_banner_construct: assertion 'package != NULL' failed
Nov 24 16:51:09 rosie io.elementary.a[1351229]: g_object_ref_sink: assertion 'G_IS_OBJECT (object)' failed
Nov 24 16:51:09 rosie io.elementary.a[1351229]: gtk_container_add: assertion 'GTK_IS_WIDGET (widget)' failed
Nov 24 16:51:09 rosie io.elementary.appcenter.desktop[1351229]: **
Nov 24 16:51:09 rosie io.elementary.appcenter.desktop[1351229]: Gtk:ERROR:../../../../gtk/gtkcssnode.c:319:lookup_in_global_parent_cache: assertion failed: (node->cache == NULL)
Nov 24 16:51:09 rosie io.elementary.appcenter.desktop[1351229]: Bail out! Gtk:ERROR:../../../../gtk/gtkcssnode.c:319:lookup_in_global_parent_cache: assertion failed: (node->cache == NULL)
Nov 24 16:51:09 rosie kernel: io.elementary.a[1351298]: segfault at 0 ip 0000000000000000 sp 00007ff0c21fbeb8 error 14 in io.elementary.appcenter[55bf7508a000+1c000] likely on CPU 7 (core 3, socket 0)
Nov 24 16:51:09 rosie kernel: Code: Unable to access opcode bytes at 0xffffffffffffffd6.
Nov 24 16:51:09 rosie gnome-shell[2118]: meta_window_set_stack_position_no_sync: assertion 'window->stack_position >= 0' failed
Nov 24 16:51:09 rosie gnome-shell[2118]: meta_window_set_stack_position_no_sync: assertion 'window->stack_position >= 0' failed
Nov 24 16:51:09 rosie gnome-shell[2118]: meta_window_set_stack_position_no_sync: assertion 'window->stack_position >= 0' failed

[GabrielVander]

I have a similar issue

$ io.elementary.appcenter

** (io.elementary.appcenter:46312): CRITICAL **: 12:00:04.774: app_center_widgets_banner_construct: assertion 'package != NULL' failed

(io.elementary.appcenter:46312): GLib-GObject-CRITICAL **: 12:00:04.774: g_object_ref_sink: assertion 'G_IS_OBJECT (object)' failed

(io.elementary.appcenter:46312): Gtk-CRITICAL **: 12:00:04.774: gtk_container_add: assertion 'GTK_IS_WIDGET (widget)' failed

(io.elementary.appcenter:46312): GLib-CRITICAL **: 12:00:05.485: g_strsplit: assertion 'string != NULL' failed
Segmentation fault (core dumped)