ValueError: buffer size must be a multiple of element size

[MichielBontenbal]

At starting the script I get the following error in +/- 50% of the cases:

Exception in thread captor:
Traceback (most recent call last):
File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
self.run()
File "/usr/lib/python3.7/threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "/home/pi/git/OpenEars/devicehive-dev/audio/captor.py", line 93, in _capture
self._callback(capture_buf)
File "capture_mqtt.py", line 74, in _process
self._process_buf = np.frombuffer(data, dtype=np.int16)
ValueError: buffer size must be a multiple of element size