Index Error in _get_reply routine

[rgmcleod52]

I have your code running on a Raspberry Pi. And for the most part it is working, but occasionally I get an IndexError that kills the program.

The problem occurs in the _get_reply(self) function on this line of the sds011.py file:

 if (sum(d for d in data) & 255 !+ raw[8]:
      return None

What I see on the console is as follows:

Traceback (most recent call last):
File "./Combo_ATH_AIO_Web_Thingspeak.py", line 141, in
pmt_2_5, pmt_10 = get_data()
File "./Combo_ATH_AIO_Web_Thingspeak.py", line 97, in get_data
AQISENSOR.sleep(sleep=False)
File "/home/pi/Combo-AIO-Web-Thingspeak/sds011.py", line 113, in sleep
self._get_reply()
File "/home/pi/Combo-AOI-Web-Thingspeak/sds011.py", line 57, in _get_reply
if (sum(d for d in data) & 255 != raw[8];
IndexError: index out of range

I'm not proficient enough with Python to see what the problem is here, so hoping you (or someone else) can help me with this.

Regards,

rgmcleod52