title: GitHub App & Heroku — fatal: Reference has invalid format: 'refs/remotes/heroku/master'
body: <p>I am using the Git app and every time I open a certain repo I get this error:</p>
  
  <p><a href="http://cl.ly/image/271p2h283j1g" rel="nofollow">http://cl.ly/image/271p2h283j1g</a></p>
  
  <p>Any help would be great. Thanks.</p>