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Do a truth check after capture.read on the returned, if the return is true, only then proceed. I faced a similar problem, this fixed that.

See this example:

import numpy as np
import cv2

cap=cv2.VideoCapture(0)  
while(cap.isOpened()):
    #cpature frame by frame
    ret,frame=cap.read()
    if(ret):        #if cam read is successful

        #ops here:
        gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)

        #disp the resulting frame
        cv2.imshow('Grayframe :: q to exit',gray)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
#when everything else done,release capture
cap.release()
cv2.destroyAllWindows()

Do a truth check after capture.read on the returned, returned value, if the return is true, only then proceed. I faced a similar problem, this fixed that.

See this example:

import numpy as np
import cv2

cap=cv2.VideoCapture(0)  
while(cap.isOpened()):
    #cpature frame by frame
    ret,frame=cap.read()
    if(ret):        #if cam read is successful

        #ops here:
        gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)

        #disp the resulting frame
        cv2.imshow('Grayframe :: q to exit',gray)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
#when everything else done,release capture
cap.release()
cv2.destroyAllWindows()