Bug 1644488

Description of problem:
Hi! i open the Control Center after upgrading to F29. 

All options worked perfect, but as soon i clicked in thunderbolt. CC Crash.  Running from console gives: 

Result -> CC Crash.
Expected -> CC Stating that ther is no Thunderbolt device in laptop (As F28 Said before).

Running from console:

pewpew  ~  gnome-control-center
(gnome-control-center:16183): thunderbolt-cc-panel-WARNING **: 22:47:43.173: Could not create client: Error calling StartServiceByName for org.freedesktop.bolt: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit bolt.service is masked.
Segmentation fault (core dumped)
 pewpew  ~  gnome-control-center background 
(gnome-control-center:16348): thunderbolt-cc-panel-WARNING **: 22:47:47.154: Could not create client: Error calling StartServiceByName for org.freedesktop.bolt: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit bolt.service is masked.
Segmentation fault (core dumped)

Selecting Wifi (maybe another one works too?) allow me to enter the CC (after two times)

 pewpew  ~  gnome-control-center 
(gnome-control-center:17228): thunderbolt-cc-panel-WARNING **: 22:48:45.103: Could not create client: Error calling StartServiceByName for org.freedesktop.bolt: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit bolt.service is masked.
Segmentation fault (core dumped)

Result -> CC Crash

 pewpew  ~  gnome-control-center wifi
(gnome-control-center:17389): thunderbolt-cc-panel-WARNING **: 22:48:50.103: Could not create client: Error calling StartServiceByName for org.freedesktop.bolt: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit bolt.service is masked.
Segmentation fault (core dumped)

Result -> CC Crash

 pewpew  ~  gnome-control-center wifi

Result -> CC opens.

Laptop UX410UAR with not thunderbolt device. 

Version-Release number of selected component:
gnome-control-center-3.30.1-3.fc29

Additional info:
reporter:       libreport-2.9.6
backtrace_rating: 4
cmdline:        gnome-control-center
crash_function: g_object_notify_queue_thaw
executable:     /usr/bin/gnome-control-center
journald_cursor: s=6f6ac97f9aca4e62a1e5f2446ea2204a;i=62e6c;b=fa084d2d635045558cc44b10485dd4fe;m=250d5fff;t=5797c5e5404d6;x=2fcc1bc094d469a7
kernel:         4.18.16-300.fc29.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 g_object_notify_queue_thaw at gobject.c:289
 #1 g_object_new_internal at gobject.c:1862
 #2 g_object_new_valist at gobject.c:2128
 #4 gdk_pixbuf_new_from_data at ../gdk-pixbuf/gdk-pixbuf-data.c:70
 #5 symbolic_cache_get_proxy at gtkicontheme.c:4303
 #6 gtk_icon_info_load_symbolic_internal at gtkicontheme.c:4625
 #7 gtk_icon_info_load_symbolic at gtkicontheme.c:4726
 #8 ensure_surface_for_gicon at gtkiconhelper.c:466
 #9 gtk_icon_helper_load_surface at gtkiconhelper.c:566
 #10 gtk_icon_helper_ensure_surface at gtkiconhelper.c:603