Impossible to change group avatar

Summary

Impossible to change group avatar.

Steps to reproduce

Create a group and a project inside this group. Publish a NPM package in this project. Try to change the avatar of the group.

Example Project

https://gitlab.com/2cs

What is the current bug behavior?

When I click on "Save changes" after choosing a new avatar, the following error appears.

What is the expected correct behavior?

When I click on "Save changes" after choosing a new avatar, the new avatars appears.

Relevant logs and/or screenshots

group_image_error

Output of checks

This bug happens on GitLab.com