It looks like this glib error always comes first:
Feb 24 15:24:48 kab gnome-shell[1013]: invalid (NULL) pointer instance Feb 24 15:24:48 kab gnome-shell[1013]: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed ... Feb 24 15:25:39 kab gnome-shell[1013]: JS ERROR: Gio.IOErrorEnum: Error calling StartServiceByName for org.gnome.SessionManager: Timeout was reached
It looks like this glib error always comes first:
Feb 24 15:24:48 kab gnome-shell[1013]: invalid (NULL) pointer instance connect_ data: assertion 'G_TYPE_ CHECK_INSTANCE (instance)' failed SessionManager: Timeout was reached
Feb 24 15:24:48 kab gnome-shell[1013]: g_signal_
...
Feb 24 15:25:39 kab gnome-shell[1013]: JS ERROR: Gio.IOErrorEnum: Error calling StartServiceByName for org.gnome.