title: How to handle git gc fatal: bad object refs/remotes/origin/HEAD error?
body: <p>I randomly hit this today while trying to run Git <em>garbage collect</em>:</p>
  
  <pre><code>$ git gc
  fatal: bad object refs/remotes/origin/HEAD
  error: failed to run repack
  </code></pre>
  
  <p>How do I deal with this?</p>