AttributeError: 'bytes' object has no attribute 'encode'

[homocomputeris]

Update bibs using DOI field?y(yes)/n(do nothing)y
Get DOI absent using the title?y(yes, automatic)/m(manual)/n(do nothing)m

Original title: Optimized high-order splitting methods for some classes of
parabolic equations

Traceback (most recent call last):
  File "/usr/bin/bibcure", line 177, in <module>
    main()
  File "/usr/bin/bibcure", line 137, in main
    bibs = update_bibs_get_doi(bibs)
  File "/usr/lib/python3.7/site-packages/bibcure/title.py", line 26, in update_bibs_get_doi
    bibs[i] = update_bib(bib, get_first)
  File "/usr/lib/python3.7/site-packages/bibcure/title.py", line 10, in update_bib
    found, bib_string = get_bib_from_title(bib["title"], get_first)
  File "/usr/lib/python3.7/site-packages/title2bib/crossref.py", line 72, in get_bib_from_title
    found, item = get_from_title(title, get_first)
  File "/usr/lib/python3.7/site-packages/title2bib/crossref.py", line 65, in get_from_title
    found, item = ask_which_is(title, items)
  File "/usr/lib/python3.7/site-packages/title2bib/crossref.py", line 24, in ask_which_is
    unidecode(item["title"]), unidecode(title)))
  File "/usr/lib/python3.7/site-packages/unidecode/__init__.py", line 48, in unidecode_expect_ascii
    bytestring = string.encode('ASCII')
AttributeError: 'bytes' object has no attribute 'encode'