HTTP error 500 while trying to access merge request page

Summary

We're unable to open some MR's - links are showing an 500 internal server error. Most MR's are working.

Steps to reproduce

Open any of those links: (closed repos)

• https://gitlab.com/TruckPad/apis/shipper-integration/merge_requests/104
• https://gitlab.com/TruckPad/apis/risk-assessment/merge_requests/38

What is the current bug behavior?

We're unable to work with our MR's in some projects

What is the expected correct behavior?

MR page should open with http status 200