Comment 2 for bug 861579

StacktraceTop:
 gtk_tree_store_append (tree_store=0x1, iter=0x7fff6809f310, parent=0x0) at /build/buildd/gtk+3.0-3.2.0/./gtk/gtktreestore.c:1737
 gcm_prefs_add_device (prefs=0x7f3c68826000, device=0x7f3c689922d0) at cc-color-panel.c:1716
 gcm_prefs_device_added_cb (client=<optimized out>, device=<optimized out>, prefs=0x7f3c68826000) at cc-color-panel.c:1810
 g_closure_invoke (closure=0x7f3c688318e0, return_value=0x0, n_param_values=2, param_values=0x7f3c68908e10, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=0x7f3c688ae6a0, emission_return=0x0, instance_and_params=0x7f3c68908e10) at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3272