Errors on magithub-issue-view

On doing `magithub-issue-view` followed by an issue number (and hitting tab to complete it), results in an error like this: https://gist.github.com/asheshambasta/02825f922751db858511f42547524bd6

I'm not sure what the root cause of this is and what I can do to help further debug this issue. I'm also not an elisp programmer so it could be that I'm doing something obviously wrong. 