500 Internal Server Error when enabling a deploy key more than once through API

Summary

When I try to enable a deploy key for a project more than once through the API, every subsequent call after the first returns a 500 error.

Steps to reproduce

1. Crate a deploy key named FOO in Repository A
2. In Repository B: curl --request POST --header "PRIVATE-TOKEN: ${PRIVATE_TOKEN}" "https://gitlab.com/api/v3/projects/<Repository B Id>/deploy_keys/<Deploy Key Foo Id>/enable" (Works fine)
3. Repeat 2. (Returns 500)

What is the current bug behaviour?

Doesn't change behaviour, just 500 is/was unexpected

What is the expected correct behaviour?

Something along the lines of a 201 or 304

Possible fixes

No impact, just API response was unexpected

Environment

gitlab.com