Can't update from 13.1.4

Hello,

We have a self-hosted Gitlab Enterprise Edition installation on a CentOS 8 server and I’m having trouble updating from 13.1.4.

Each time I want to update to any update (13.3.2 or 13.1.5) I have the following error :

error: %prein(13.1.5-ee.0.el8) scriptlet failed, exit status 1

By reading the /var/log/dnf.log I have some other errors :
> 2020-08-28T14:03:58Z DDEBUG /var/cache/dnf/gitlab_gitlab-ee-06493dc3ae677d64/packages/gitlab-ee-13.1.5-ee.0.el8.x86_64.rpm supprimé

2020-08-28T14:03:58Z SUBDEBUG
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 65, in main
    return _main(base, args, cli_class, option_parser_class)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 98, in _main
    return cli_run(cli, base)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 122, in cli_run
    ret = resolving(cli, base)
  File "/usr/lib/python3.6/site-packages/dnf/cli/main.py", line 166, in resolving
    base.do_transaction(display=displays)
  File "/usr/lib/python3.6/site-packages/dnf/cli/cli.py", line 257, in do_transaction
    raise dnf.exceptions.Error(_('Transaction failed'))
dnf.exceptions.Error: La transaction a échoué
2020-08-28T14:03:58Z CRITICAL Erreur : La transaction a échoué

Can you help me ? I don’t know what to do or what log files can help me.

Thank you