Project export fails with "File name too long @ rb_sysopen - [FILTERED]"

Summary

Exporting one of our projects via the GitLab project export feature fails with the error message File name too long @ rb_sysopen - [FILTERED]. There is no indication which file is problematic, nor whether the problematic file is part of the git repository, or uploaded to an issue or wiki page, so it is basically impossible to find and remove the problematic file.

Steps to reproduce

1. Go to project settings -> General -> Advanced
2. Click Export project

Example Project

https://gitlab.com/sosy-lab/software/cpachecker/

What is the current bug behavior?

No project archive is created, error message is sent via mail.

What is the expected correct behavior?

Project archive created and link to it sent via mail.

Relevant logs and/or screenshots

Full content of error mail:

Project CPAchecker couldn't be exported.
The errors we encountered were:
File name too long @ rb_sysopen - [FILTERED]

Output of checks

This bug happens on GitLab.com (on 2020-04-06 08:56:51 UTC).