In an artifact write a reference to a commit that does not exist (the wrong sha1 must have 40 chars).
Submit and stay.
➡️ You get a fatal error.
2021/02/04 10:21:03 [error] 16625#0: *46425 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught TypeError: Argument 3 passed to Tuleap\Git\Reference\CommitDetailsCacheDao::saveCommitDetails() must be of the type string, null given, called in /usr/share/tuleap/plugins/git/include/Git/Reference/CommitDetailsRetriever.php on line 94 and defined in /usr/share/tuleap/plugins/git/include/Git/Reference/CommitDetailsCacheDao.php:47 Stack trace: #0 /usr/share/tuleap/plugins/git/include/Git/Reference/CommitDetailsRetriever.php(94): Tuleap\Git\Reference\CommitDetailsCacheDao->saveCommitDetails(216, '1dbda7eb20375f1...', NULL, '', '', 0, '', '', 0, '', '') #1 /usr/share/tuleap/plugins/git/include/Git/Reference/CommitDetailsRetriever.php(49): Tuleap\Git\Reference\CommitDetailsRetriever->retrieveCommitDetailsFromCommit(Object(Tuleap\Git\GitPHP\Commit), Object(GitRepository)) #2 /usr/share/tuleap/plugins/git/include/Git/Reference" while reading upstream, client: 132.167.134.254, server: codev-tuleap.cea.fr, request: "GET /plugins/tracker/?aid=19965 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "codev-tuleap.cea.fr", referrer: "https://codev-tuleap.cea.fr/plugins/tracker/?tracker=73"
Issue introduced by git #tuleap/stable/5baac14c7e2cc13e558289228a536d728e34e3f6