Strange behavior with pdf-folder and bibtex folder

[VolkovIlia]

my config:

{
  "bibtex": "/home/user/Library/Bibtex/lib.bib",
  "filesdir": "/home/user/Library/PDFs",
  "git": true,
  "gitdir": "/home/user/Library"
}

If I trying to use paper add file.pdf I got error:

Traceback (most recent call last):
  File "/usr/bin/papers", line 5, in <module>
    papers.bib.main()
  File "/usr/lib/python3.9/site-packages/papers/bib.py", line 1350, in main
    check_install() and addcmd(o)
  File "/usr/lib/python3.9/site-packages/papers/bib.py", line 987, in addcmd
    savebib(my, o)
  File "/usr/lib/python3.9/site-packages/papers/bib.py", line 898, in savebib
    config.gitcommit()
  File "/usr/lib/python3.9/site-packages/papers/config.py", line 115, in gitcommit
    if not os.path.samefile(self.bibtex, target):
  File "/usr/lib/python3.9/genericpath.py", line 101, in samefile
    s2 = os.stat(f2)
FileNotFoundError: [Errno 2] No such file or directory: '/home/user/Library/lib.bib'

But bib file is located /home/user/Library/Bibtex/lib.bib If I add sim-link from /home/user/Library/Bibtex/lib.bib -> /home/user/Library/lib.bib it works fine.