Ininite loop on debian

[flsap]

Good day,

I have an extract.py file that takes a pdf location as parameter and executes the extract. This is working fine on Arch linux,
however on a debian 9 (or 10, up to date) it goes into an infinite loop.

command I am trying to run :
./extract.py /tmp/p_3f4b8d2131dca8b1e1890d1b890ceb26.pdf

extract.py source:
`
import sys
from refextract import extract_references_from_file

if len(sys.argv) != 2:
sys.exit()

references = extract_references_from_file(sys.argv[1])
`

when I ctrl+c the cycle, it gives the following output:
^CTraceback (most recent call last): File "./extract.py", line 9, in <module> references = extract_references_from_file(sys.argv[1]) File "/home/sspm/.local/lib/python3.7/site-packages/refextract/references/api.py", line 139, in extract_references_from_file override_kbs_files=override_kbs_files, File "/home/sspm/.local/lib/python3.7/site-packages/refextract/references/engine.py", line 1456, in parse_references parse_references_elements(reference_lines, kbs, linker_callback) File "/home/sspm/.local/lib/python3.7/site-packages/refextract/references/engine.py", line 878, in parse_references_elements clean_line, kbs, bad_titles_count, linker_callback) File "/home/sspm/.local/lib/python3.7/site-packages/refextract/references/engine.py", line 635, in parse_reference_line bad_titles_count) File "/home/sspm/.local/lib/python3.7/site-packages/refextract/references/tag.py", line 174, in tag_reference_line kbs=kbs, File "/home/sspm/.local/lib/python3.7/site-packages/refextract/references/tag.py", line 326, in process_reference_line tagged_line = identify_and_tag_authors(tagged_line, kbs['authors']) File "/home/sspm/.local/lib/python3.7/site-packages/refextract/references/tag.py", line 881, in identify_and_tag_authors re_auth, re_auth_near_miss = get_author_regexps() File "/home/sspm/.local/lib/python3.7/site-packages/refextract/authors/regexs.py", line 470, in get_author_regexps re.VERBOSE | re.UNICODE)) File "/usr/lib/python3.7/re.py", line 234, in compile return _compile(pattern, flags) File "/usr/lib/python3.7/re.py", line 286, in _compile p = sre_compile.compile(pattern, flags) File "/usr/lib/python3.7/sre_compile.py", line 764, in compile p = sre_parse.parse(p, flags) File "/usr/lib/python3.7/sre_parse.py", line 930, in parse p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, 0) File "/usr/lib/python3.7/sre_parse.py", line 426, in _parse_sub not nested and not items)) File "/usr/lib/python3.7/sre_parse.py", line 816, in _parse p = _parse_sub(source, state, sub_verbose, nested + 1) File "/usr/lib/python3.7/sre_parse.py", line 426, in _parse_sub not nested and not items)) File "/usr/lib/python3.7/sre_parse.py", line 816, in _parse p = _parse_sub(source, state, sub_verbose, nested + 1) File "/usr/lib/python3.7/sre_parse.py", line 426, in _parse_sub not nested and not items)) File "/usr/lib/python3.7/sre_parse.py", line 816, in _parse p = _parse_sub(source, state, sub_verbose, nested + 1) File "/usr/lib/python3.7/sre_parse.py", line 426, in _parse_sub not nested and not items)) File "/usr/lib/python3.7/sre_parse.py", line 816, in _parse p = _parse_sub(source, state, sub_verbose, nested + 1) File "/usr/lib/python3.7/sre_parse.py", line 426, in _parse_sub not nested and not items)) File "/usr/lib/python3.7/sre_parse.py", line 587, in _parse set = _uniq(set) File "/usr/lib/python3.7/sre_parse.py", line 413, in _uniq if item not in newitems: KeyboardInterrupt

Additional information:
Python version: 3.7
pdftotext version: 0.71.0 (this extracts text from the pdf just fine)
one of the pdf files that I used (one of many, it hangs on every one, but every one is successfully processed on Arch linux):
a.pdf