Updating/Creating new Pull request creates dead lock

First I tried to update an existing Pull request since I had made two commits to the feature branch, that I wanted to merge into develop. The spinner went on forever so I reload the page and tried again. No luck. Tried the same procedure again without any luck. Then I declined the Pull request and decided to create a new one.

However, the same thing happened when I clicked "Create pull request". The spinner to the left of the button goes on forever and the request is not created. See attached image.