Internal Server Error when trying to attach files to an Epic

Summary

We see Internal Server Error when we try to attach a file to an Epic

Steps to reproduce

Create any epic -> Proceed to the comments section to add a comment -> Attach a file

Example Project

https://gitlab.com/groups/services-support-testing/-/epics/1

What is the current bug behavior?

Attachment's not added, server error displayed

What is the expected correct behavior?

Attachment should be added

Relevant logs and/or screenshots

https://prnt.sc/kqrmyi

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