TypeError: '_hashlib.HASH' object has no attribute '__getitem__' about jsunpack-n HOT 2 OPEN

Apologies I forgot the error message

Traceback (most recent call last):
  File "jsunpackn.py", line 1406, in <module>
    main()
  File "jsunpackn.py", line 1347, in main
    js = jsunpack(file, ['', mydata, file], options)
  File "jsunpackn.py", line 174, in __init__
    self.main_decoder(mydata, myfile)
  File "jsunpackn.py", line 1018, in main_decoder
    mypdf.parse()
  File "/home/***/Documents/malwarecb/javascript/jsunpack-n/pdf.py", line 518, in parse
    self.encryptKey = self.computeEncryptKey(self.encryptObject, passwd, fileId)
  File "/home/***/Documents/malwarecb/javascript/jsunpack-n/pdf.py", line 812, in computeEncryptKey
    key = md5(key[0:encryptObject['KeyLength']])
TypeError: '_hashlib.HASH' object has no attribute '__getitem__'

I'll have this to, anyone have a solution?