Crash when USB interface connected

Hapening in Juno, I'm up to date.

Opening the sound setting panel crashes when my USB audio interface is connected. I have a M-Audio interface and it was working properly in Loki. Now I cannot adjust volume. If the interface isn't connected, everything is okay.

If I connect a usb interface when the sound setting is openned, the whole switchboard crashes...

I started it in GDB, but it's not compiled with the debug symbols, so it's not that helpful, but might help... maybe...

```
$ gdb io.elementary.switchboard
GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
.
Find the GDB manual and other documentation resources online at:
.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from io.elementary.switchboard...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/bin/io.elementary.switchboard
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe4da8700 (LWP 5093)]
[New Thread 0x7fffdffff700 (LWP 5094)]
[New Thread 0x7fffd3784700 (LWP 5095)]
[New Thread 0x7fffd2f83700 (LWP 5096)]

Thread 1 "io.elementary.s" received signal SIGSEGV, Segmentation fault.
0x00007fffbedc1fb2 in ?? () from /usr/lib/x86_64-linux-gnu/switchboard/system/libsound.so
(gdb) c
Continuing.
Couldn't get registers: No such process.
Couldn't get registers: No such process.
(gdb) [Thread 0x7fffd2f83700 (LWP 5096) exited]
[Thread 0x7fffd3784700 (LWP 5095) exited]
[Thread 0x7fffdffff700 (LWP 5094) exited]
[Thread 0x7fffe4da8700 (LWP 5093) exited]

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
```

---
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