Error 500 in /internal/post_receive when a deploy key is used

https://sentry.gitlap.com/gitlab/gitlabcom/issues/115147/

NoMethodError: undefined method `id' for nil:NilClass
  lib/api/internal.rb:205:in `block (2 levels) in <class:Internal>'
    redirect_message = Gitlab::Checks::ProjectMoved.fetch_redirect_message(user.id, project.id)
  lib/gitlab/middleware/multipart.rb:93:in `call'
    return @app.call(env) if encoded_message.blank?
  lib/gitlab/request_profiler/middleware.rb:14:in `call'
    @app.call(env)
  lib/gitlab/database/load_balancing/rack_middleware.rb:37:in `call'
    result = @app.call(env)
  lib/gitlab/jira/middleware.rb:15:in `call'
    @app.call(env)
...
(113 additional frame(s) were not displayed)

NoMethodError: undefined method `id' for nil:NilClass