bup exits on error after successfull save

[P]

bup "-d" "/mnt/syno_backups/sauvegardes/kup" "save" "-n" "kup" "-vv" "/home/pascal"

Saving: 100.00% (6488352/6488352k, 73704/73704 files), done.
Traceback (most recent call last):cts)
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/lib/bup/bup/main.py", line 417, in <module>
    main()
  File "/usr/lib/bup/bup/main.py", line 414, in main
    wrap_main(lambda : run_subcmd(cmd_module, subcmd))
  File "/usr/lib/bup/bup/compat.py", line 98, in wrap_main
    sys.exit(main())
             ^^^^^^
  File "/usr/lib/bup/bup/main.py", line 414, in <lambda>
    wrap_main(lambda : run_subcmd(cmd_module, subcmd))
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/bup/bup/main.py", line 409, in run_subcmd
    run_module_cmd(module, args)
  File "/usr/lib/bup/bup/main.py", line 323, in run_module_cmd
    import_and_run_main(module, args)
  File "/usr/lib/bup/bup/main.py", line 287, in import_and_run_main
    module.main(args)
  File "/usr/lib/bup/bup/cmd/save.py", line 518, in main
    with msr, \
  File "/usr/lib/bup/bup/index.py", line 70, in __exit__
    with pending_raise(value, rethrow=True):
  File "/usr/lib/bup/bup/compat.py", line 45, in __exit__
    raise self.ex
  File "/usr/lib/bup/bup/cmd/save.py", line 518, in main
    with msr, \
  File "/usr/lib/bup/bup/index.py", line 458, in __exit__
    self.close()
  File "/usr/lib/bup/bup/index.py", line 503, in close
    self.save()
  File "/usr/lib/bup/bup/index.py", line 499, in save
    self.m.flush()
OSError: [Errno 116] Stale file handle
Exception ignored in: <function mmap.__del__ at 0x7fcacb33e8e0>
Traceback (most recent call last):
  File "/usr/lib/bup/bup/io.py", line 60, in __del__
AssertionError:

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: bup 0.33-2
ProcVersionSignature: Ubuntu 6.2.0-1003.3-lowlatency 6.2.6
Uname: Linux 6.2.0-1003-lowlatency x86_64
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Thu May 25 00:19:12 2023
InstallationDate: Installed on 2019-06-02 (1452 days ago)
InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: bup
UpgradeStatus: Upgraded to lunar on 2023-04-21 (33 days ago)