title: cvs error on checkin
body: <p>When trying to commit to a cvs branch after adding a new file I get this error</p>
  
  <pre><code>Assertion failed: key != NULL, file hash.c, line 317
  </code></pre>
  
  <p>Any idea how to fix it so I can check my code in?<br>
  Both server and client are Linux and there are pre-commits involved.</p>