UnicodeDecodeError not caught

[chrishannam]

 $ /home/channam/.local/bin/jocasta -p /dev/ttyUSB0
Traceback (most recent call last):
  File "/home/channam/.local/bin/jocasta", line 10, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/home/channam/.local/lib/python3.7/site-packages/jocasta/collector.py", line 50, in main
    reading = sensor_reader.read()
  File "/home/channam/.local/lib/python3.7/site-packages/jocasta/inputs/serial_connector.py", line 65, in read
    return json.loads(raw_serial)
  File "/usr/lib/python3.7/json/__init__.py", line 343, in loads
    s = s.decode(detect_encoding(s), 'surrogatepass')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfb in position 0: invalid start byte