run the server without having any clients connect, then browse to a song info page in the web interface 
and click on download.  this will cause the server to crash.  Here's a patch:

Index: Slim/Web/HTTP.pm
===============================================================
====
RCS file: /home/cvs/cvsroot/slim/server/Slim/Web/HTTP.pm,v
retrieving revision 1.109
diff -r1.109 HTTP.pm
999c999,1001
<       assert($client);
---
> 
>       # when we are streaming a file, we may not have a client, rather it might just be going to a web 
browser.
>       # assert($client);
1002a1005
> 
1007c1010
<       if (($client->model eq 'squeezebox') && defined($httpClient) &&
---
>       if ($client && ($client->model eq 'squeezebox') && defined($httpClient) &&