I got this exception as well. I am using Tomcat 5.5.20. This might happen
when session expired or discarded. 
I think this is a bug in acegi's TokenBasedRememberMeServices class. B/c the
auth getting from SecurityContextHolder.getContext().getAuthentication() is
null when session is expired, so the TokenBasedRememberMeServices:295 should
be skipped if authentication is null.
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