The issue just happened there on Ubuntu, having the bluetooth settings open and trying to route audio from a phone to the computer

The issue seems to still happen in new version of gnome-control-center, the report on https://bugzilla.redhat.com/show_bug.cgi?id=1044090 has a stacktrace corresponding

"control-center-3.10.2-3.fc20

#0 g_type_check_instance_cast at gtype.c:4003
 #1 iter_search at bluetooth-client.c:102
 #2 get_iter_from_proxy at bluetooth-client.c:175
 #3 device_g_properties_changed at bluetooth-client.c:256
 #4 ffi_call_unix64 at ../src/x86/unix64.S:76
 #5 ffi_call at ../src/x86/ffi64.c:522
 #6 g_cclosure_marshal_generic at gclosure.c:1454
 #11 on_properties_changed at gdbusproxy.c:1147
 #12 emit_signal_instance_in_idle_cb at gdbusconnection.c:3743
 #16 g_main_context_iteration at gmain.c:3774
...
I tried to send a picture via bluetooth from my mobile to my laptop, while I was using the "Sharing"-pane in the gnome-control-center."