Desktop Crash

[Superdanby]

Gnome session frequently crashes at the login screen.
Here's the log:

May 19 20:19:22 localhost.localdomain gnome-shell[1646]: JS ERROR: Error: Type name RandWallSettingsWidget is already registered
                                                         GObjectMeta<._construct@resource:///org/gnome/gjs/modules/overrides/GObject.js:145
                                                         wrapper@resource:///org/gnome/gjs/modules/lang.js:178
                                                         Class.prototype._construct/newClass@resource:///org/gnome/gjs/modules/lang.js:213
                                                         @/home/$USERNAME/.local/share/gnome-shell/extensions/Random_Walls@Antares/prefs.js:204
                                                         @/home/$USERNAME/.local/share/gnome-shell/extensions/Random_Walls@Antares/extension.js:8
                                                         initExtension@resource:///org/gnome/shell/ui/extensionSystem.js:220
                                                         enableExtension@resource:///org/gnome/shell/ui/extensionSystem.js:109
                                                         _onVersionValidationChanged/<@resource:///org/gnome/shell/ui/extensionSystem.js:284
                                                         _onVersionValidationChanged@resource:///org/gnome/shell/ui/extensionSystem.js:283
May 19 20:19:22 localhost.localdomain gnome-shell[1646]: gsignal.c:2641: instance '0x55e41dae6e80' has no handler with id '129310'
May 19 20:19:22 localhost.localdomain gnome-shell[1646]: JS ERROR: Error: No signal connection 0 found
                                                         _disconnect@resource:///org/gnome/gjs/modules/signals.js:74
                                                         PopupMenuBase<.destroy@resource:///org/gnome/shell/ui/popupMenu.js:725
                                                         wrapper@resource:///org/gnome/gjs/modules/lang.js:178
                                                         _parent@resource:///org/gnome/gjs/modules/lang.js:131
                                                         PopupMenu<.destroy@resource:///org/gnome/shell/ui/popupMenu.js:858
                                                         wrapper@resource:///org/gnome/gjs/modules/lang.js:178
                                                         Button<.destroy@resource:///org/gnome/shell/ui/panelMenu.js:185
                                                         wrapper@resource:///org/gnome/gjs/modules/lang.js:178
                                                         _parent@resource:///org/gnome/gjs/modules/lang.js:131
                                                         RandWallMenu<.destroy@/home/$USERNAME/.local/share/gnome-shell/extensions/Random_Walls@Antares/extension.js:296
                                                         wrapper@resource:///org/gnome/gjs/modules/lang.js:178
                                                         applyChanges@/home/$USERNAME/.local/share/gnome-shell/extensions/Random_Walls@Antares/extension.js:354